PRO Courses Hot Guides Tech Help Pro Expert Videos About wikiHow Pro Upgrade
QUIZZES All Quizzes Hot Love Quizzes Personality Quizzes Trivia Quizzes Taylor Swift Quizzes
EDIT Edit this Article
EXPLORE Tech Help ProAbout UsRandom ArticleQuizzes Request a New ArticleCommunity DashboardTrendingForums Arts and EntertainmentArtworkBooksMoviesComputers and ElectronicsComputersPhone SkillsTechnology HacksHealthMen's HealthMental HealthWomen's HealthRelationshipsDatingLoveRelationship Issues Hobbies and CraftsCraftsDrawingGamesEducation & CommunicationCommunication SkillsPersonal DevelopmentStudyingPersonal Care and StyleFashionHair CarePersonal Hygiene Quizzes Love Quizzes Personality Quizzes Fun Games Arts and EntertainmentFinance and BusinessHome and GardenRelationship Quizzes Cars & Other VehiclesFood and EntertainingPersonal Care and StyleSports and Fitness Computers and ElectronicsHealthPets and AnimalsTravel Education & CommunicationHobbies and CraftsPhilosophy and ReligionWork World Family LifeHolidays and TraditionsRelationshipsYouth
LOG IN
Log in
Social login does not work in incognito and private browsers. Please log in with your username or email to continue. FacebookGooglewikiHow Account No account yet? Create an account
RANDOM
Home
Random
Browse Articles
TrendingNew
Quizzes & Games
All QuizzesHot
Love Quizzes
Personality Quizzes
Fun Games
Dating Simulator
Learn Something New
Forums
Courses
Happiness Hub
Explore More
Support wikiHow
About wikiHow
Log in / Sign up
Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow
Categories
Pets and Animals
Fish
Fish Breeds
Betta
How to Tell How Old a Betta Fish Is Download Article Co-authored by Deanne Pawlisch, CVT, MA
Last Updated: March 10, 2025 Fact Checked
Download Article
Determining Age with Features
|
Identifying Signs of Aging
|
Expert Q&A
|
Tips
|Show more|Show less X
This article was co-authored by Deanne Pawlisch, CVT, MA. Deanne Pawlisch is a Certified Veterinary Technician, who does corporate training for veterinary practices and has taught at the NAVTA-approved Veterinary Assistant Program at the Harper College in Illinois. Deanne has been a Board Member of the Veterinary Emergency and Critical Care Foundation in San Antonio, Texas since 2011. She holds a BS in Anthropology from Loyola University and an MA in Anthropology from Northern Illinois University. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 542,795 times.
Bettas, otherwise known as Siamese fighting fish, are known for their snazzy colors and flowing fins. Chances are, however, when you brought your betta home in a cup from a pet store, you had no idea how old it was. It is hard to determine exactly how old your betta is, but by using some common sense and observations of your fish, you might be able to make a very close estimate.
Steps
Method 1 Method 1 of 2:
Determining Age with Features
Download Article
1 Check your betta's size. Normal adult bettas are usually around 3 inches (7.6 cm) in length. Hold a measuring tape up to your fish's tank and see how long it is. If your betta is less than the average, your betta is most likely a juvenile.[1]XResearch source
It can be hard to measure a betta exactly. In most cases, it will be enough to simply get an estimate by holding up a measuring tape against the glass. Be patient since most healthy bettas do not stay still often.
2 Check your betta's fins. Adult bettas have nice and beautiful flowing fins. If your betta has this characteristic, this is a good sign that it is an adult. If it has tiny fins, then it is either a juvenile or a baby.[2]XResearch source
Make sure you know the sex of your betta. Female bettas never get long, flowing fins like the males do.
Don't confuse normal wear with injuries from diseases.
Crowntails naturally have 'torn'- looking fins.
Older betta's fins have typically undergone lots of wear and tear. They may have tiny tears or shredded ends.
Advertisement
3 Assess the color of your betta. In general, young bettas are vibrant and middle-aged bettas are slightly faded. The color of the scales of an older betta will be slightly faded and muted.
Note: Bettas that are bred for pets come in a wide variety of colors. However, wild betta fish tend to be grey or dull colored, and only show flashes of color when fighting.
Advertisement Method 2 Method 2 of 2:
Identifying Signs of Aging
Download Article
1 Look for changes in your fish's body. You might notice that with every day, your betta seems to be getting paler or even with daily feeding your fish gets skinnier. These are signs of an aging betta.[3]XResearch source
Tip: As a betta ages, its back may also begin to arch. An old betta's back is usually humped, while a younger betta's back is more straight. The hump is rounded, so don't confuse this for a sharp spinal problem.
2 Pay attention to changes in energy. Your betta will flare with much less gusto than it used to when it get old. After so many years, many bettas lose the enthusiasm to flare.
Also, while a healthy adult betta will swim around vigorously in its tank, old bettas will hide behind plants and décor and swim sluggishly.
When feeding your betta, watch it to see how quickly it spots its food. Old bettas may swim slowly to their food and miss it a couple of times before spotting it.
3 Look for cataracts on the betta's eyes. Old bettas tend to have "cataracts," which are filmy or hazy spots inside the eye. This is normal for old bettas, and will happen no matter how big the tank you have is or how clean you keep the water.[4]XResearch source
Tip: If the fishes' eyes are black and hard to see, that is a sign of a healthy adult betta.
Advertisement
Expert Q&A
Search Add New Question
Question My betta is very active, but he often misses a lot of his food when eating. What does this mean? Deanne Pawlisch, CVT, MA Certified Veterinary Technician Deanne Pawlisch is a Certified Veterinary Technician, who does corporate training for veterinary practices and has taught at the NAVTA-approved Veterinary Assistant Program at the Harper College in Illinois. Deanne has been a Board Member of the Veterinary Emergency and Critical Care Foundation in San Antonio, Texas since 2011. She holds a BS in Anthropology from Loyola University and an MA in Anthropology from Northern Illinois University. Deanne Pawlisch, CVT, MA Certified Veterinary Technician Expert Answer If your betta is eating when you feed him but not consuming all of his food, you may be overfeeding him. Often bettas only require 2-3 pellets per feeding. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 54 Helpful 234
Question I believe my betta was at least a year old when I got him, as he had fully formed fins and a slight arch in his back. He never made a bubble nest, though. What does this mean about his age? Deanne Pawlisch, CVT, MA Certified Veterinary Technician Deanne Pawlisch is a Certified Veterinary Technician, who does corporate training for veterinary practices and has taught at the NAVTA-approved Veterinary Assistant Program at the Harper College in Illinois. Deanne has been a Board Member of the Veterinary Emergency and Critical Care Foundation in San Antonio, Texas since 2011. She holds a BS in Anthropology from Loyola University and an MA in Anthropology from Northern Illinois University. Deanne Pawlisch, CVT, MA Certified Veterinary Technician Expert Answer You might be correct in your estimate of your betta’s age. Often, tank filtrations systems cause strong currents in your tank that can discourage your fish from making a bubble nest. Bubble nests are part of the breeding process, so if your fish is solitary, it may not build a bubble nest at all. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 36 Helpful 163
Ask a Question 200 characters left Include your email address to get a message when this question is answered. Submit Advertisement
Tips
If taken care of properly, bettas can live between 2 and 6 years. Thanks Helpful 11 Not Helpful 0
When you purchase a betta fish in a pet store, its age can be anywhere between 3 months to 12 months. Thanks Helpful 3 Not Helpful 1
Take note of the date when you purchase your betta fish. This will help you keep track of how old it is generally. Thanks Helpful 2 Not Helpful 2
Show More Tips
Tips from our Readers
The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.
Keep the tank clean and feed your betta properly for a happy, healthy fish. Use silk plants instead of plastic to avoid torn fins. A well-cared for betta can live 3-4 years.
Watch for changes like reduced energy, appetite loss, or cataracts. These can indicate aging. But note bettas aren't always visibly happy!
Females can have long fins too — don't rely on fin length to determine gender. The egg spot is the best indicator for sexing bettas.
For multiple bettas, separate tanks are safest. Only house together when breeding, and ensure the female has an egg spot.
Live plants help oxygenate the water and provide stimulation. Rotate decorations periodically for mental enrichment.
Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement
You Might Also Like
How toDetermine the Sex of a Betta FishHow toTell if Your Goldfish Is an AdultHow toTell the Age of a Bearded DragonHow toIdentify Different Betta FishHow toHelp a Betta Fish Live LongerHow toSelectively Breed Betta FishHow to Determine the Age of Your CatHow to Tell the Age of a Parakeet (Budgie): A Step-by-Step GuideHow to Know If a Betta Fish Is Sick or Dying: Signs & SymptomsHow to Tell How Old Your Dog Is (Human & Dog Years)How toHave a Happy Betta FishHow toDetermine the Sex of a FishHow to Play and Bond with Your Betta FishHow to Take Care of a Betta Fish Advertisement
Co-authored by: Deanne Pawlisch, CVT, MA Certified Veterinary Technician This article was co-authored by Deanne Pawlisch, CVT, MA. Deanne Pawlisch is a Certified Veterinary Technician, who does corporate training for veterinary practices and has taught at the NAVTA-approved Veterinary Assistant Program at the Harper College in Illinois. Deanne has been a Board Member of the Veterinary Emergency and Critical Care Foundation in San Antonio, Texas since 2011. She holds a BS in Anthropology from Loyola University and an MA in Anthropology from Northern Illinois University. This article has been viewed 542,795 times. 280 votes - 92% Co-authors: 28Updated: March 10, 2025 Views: 542,795 Categories: BettaArticle SummaryX
To tell how old a betta fish is, measure the fish and asses the size of its fins. Adult bettas will usually be around 3 inches long and have long, flowing fins, while juveniles will be smaller with shorter fins. Another way to tell age is by looking at the coloring of the betta. Bettas are vibrant and colorful when young and generally become duller and more faded as they age. You can tell if bettas are old by seeing if they have a humped body or cataracts in their eyes. To learn how to tell the sex of a betta, scroll down!Did this summary help you?YesNo
In other languages Portuguese Italian Spanish French German Indonesian Russian Dutch Arabic Chinese Vietnamese Hindi Korean Thai Japanese
Print
Send fan mail to authors
Thanks to all authors for creating a page that has been read 542,795 times.
Reader Success Stories
Sophia Munar
Apr 26, 2016
"Hey! I just got a Betta fish, I named it Killer. It's old but we take good care of it.This article helped me so much. Killer is so playful even though it's old. We haven't got a larger aquarium for it, we have an aquarium but my other fishes are in that one. This showed tips. I thank you for all of them."..." more
More reader stories Hide reader stories Share your story
Did this article help you?
Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Deanne Pawlisch, CVT, MA Certified Veterinary Technician Co-authors: 28Updated: March 10, 2025 Views: 542,79592% of readers found this article helpful. 280 votes - 92% Click a star to add your vote
Sophia Munar
Apr 26, 2016
"Hey! I just got a Betta fish, I named it Killer. It's old but we take good care of it.This article helped me so much. Killer is so playful even though it's old. We haven't got a larger aquarium for it, we have an aquarium but my other fishes are in that one. This showed tips. I thank you for all of them."..." more
Cristina Costa
Mar 29, 2020
"I know how to care for my bettas--Cotton candy my male betta and my new baby female betta Midnight. Thank you so much Wiki. My male betta cotton candy is sick with ich. I am so sad! And I know how to cure him too. I love him so much and I had him for 2 years and I don't want him to die so soon."..." more Rated this article:
Brianna Q.
Jan 29, 2024
"This article helped me a lot! Most commonly I was confused because of why my Betta fish was low and had a huge change in body shape. As a fish owner I wanted to know if he was sick or if he was simply getting old. Thanks to these methods. I'm bittersweet."..." more
Hannah Shields
Jun 28, 2019
"I just got a female betta not too long ago. I asked the store how old the betta was, and they said they didn't know. So I had to try to find out myself. I read this article and now I know that my betta is only about 6 or 7 months old. Thanks for the help."..." more
Neeta Chakrabarty
May 29, 2019
"I went to a fish store for some guppies and came across a dirty bowl with a fish. It was a betta baby! I brought him home and I had no prior idea about how to deal with cleaning and all. My daughter spotted your article and it has been a great help."..." more Share yours! More success stories Hide success stories
Quizzes & Games
What Age Is My Brain QuizTake QuizHow Old Do People Think I Look QuizTake QuizWhat Kind of Cat Am I QuizTake QuizGuess the Animal Photo QuizTake QuizAm I Balding QuizTake QuizGuess My Age QuizTake Quiz
You Might Also Like
How toDetermine the Sex of a Betta FishHow toTell if Your Goldfish Is an AdultHow toTell the Age of a Bearded DragonHow toIdentify Different Betta Fish
Featured Articles
What 16 of the Most Common Hugs MeanJuicy, Deep, & Hot-Seat Questions to Get to Know Your Friends Better40+ Talking Games to Play with Friends, Partners & MoreHow toMake Friends
Trending Articles
What JJK Character Am I QuizWhat Emojis Mean Sex?What Pokémon Am I QuizDo I Have Brainrot QuizSigns a Woman is Sexually Attracted to YouDo You Agree with These Hygiene Hot Takes?
Featured Articles
The Different Types of People You Can Find in a Friend GroupAn Introduction to Kibbe Body Types (with Styling Tips!)Being the Little Spoon While Cuddling: Is It Better Than the Big Spoon?From Alpha to Omega: A Guide to the 7 Male Personalities
Featured Articles
7 Easy Card Magic Tricks You Can Master in MinutesHow to Perform Magic: 8 Tricks for BeginnersHow toHypnotize SomeoneThe Easiest Guinness World Records to Break: Which Will You Try?How to Solve a Rubik's Cube in 20 MovesHow toWhistle with Two Fingers
Watch Articles
How toGrow Out Your BangsHow toDress PunkHow toEnd a Long Distance RelationshipHow toDo E Girl EyelinerHow toRespond to the Fire EmojiHow to Stop Your Glasses from Making Your Eyes Look Small
Trending Articles
Do You Agree with These "Hear Me Out" Character Hot Takes?Introvert or Extrovert QuizWhat Color Am I Quiz24 Different Types of Bras ExplainedWhat Is My Animagus Form?Can Your Finger Length Tell Your Personality?
Quizzes & Games
How Tall Will I Be QuizTake QuizWhat Fish Am I QuizTake QuizHow Old Are You Meant To Be QuizTake QuizWhat Is My Mental Age QuizTake QuizHow Old Is My Soul QuizTake QuizWhat Is My Face Shape QuizTake Quiz
Categories
Pets and Animals
Fish
Fish Breeds
Betta
wikiHow Newsletter You're all set! Helpful how-tos delivered toyour inbox every week! Sign me up! By signing up you are agreeing to receive emails according to our privacy policy.
Download Article Co-authored by Deanne Pawlisch, CVT, MA 
Advertisement 
Co-authored by: Deanne Pawlisch, CVT, MA Certified Veterinary Technician This article was co-authored by Deanne Pawlisch, CVT, MA. Deanne Pawlisch is a Certified Veterinary Technician, who does corporate training for veterinary practices and has taught at the NAVTA-approved Veterinary Assistant Program at the Harper College in Illinois. Deanne has been a Board Member of the Veterinary Emergency and Critical Care Foundation in San Antonio, Texas since 2011. She holds a BS in Anthropology from Loyola University and an MA in Anthropology from Northern Illinois University. This article has been viewed 542,795 times. 280 votes - 92% Co-authors: 28 Updated: March 10, 2025 Views: 542,795 Categories: Betta Article SummaryX
Take Quiz
Take Quiz
Take Quiz
Take Quiz
Take Quiz
Take Quiz 
Take Quiz
Take Quiz
Take Quiz
Take Quiz
Take Quiz
Take Quiz 
559 
1 Check your betta's size. Normal adult bettas are usually around 3 inches (7.6 cm) in length. Hold a measuring tape up to your fish's tank and see how long it is. If your betta is less than the average, your betta is most likely a juvenile.[1] 
2 Check your betta's fins. Adult bettas have nice and beautiful flowing fins. If your betta has this characteristic, this is a good sign that it is an adult. If it has tiny fins, then it is either a juvenile or a baby.[2] 
3 Assess the color of your betta. In general, young bettas are vibrant and middle-aged bettas are slightly faded. The color of the scales of an older betta will be slightly faded and muted. 
1 Look for changes in your fish's body. You might notice that with every day, your betta seems to be getting paler or even with daily feeding your fish gets skinnier. These are signs of an aging betta.[3] 
2 Pay attention to changes in energy. Your betta will flare with much less gusto than it used to when it get old. After so many years, many bettas lose the enthusiasm to flare. 
3 Look for cataracts on the betta's eyes. Old bettas tend to have "cataracts," which are filmy or hazy spots inside the eye. This is normal for old bettas, and will happen no matter how big the tank you have is or how clean you keep the water.[4] 
Deanne Pawlisch, CVT, MA Certified Veterinary Technician Deanne Pawlisch is a Certified Veterinary Technician, who does corporate training for veterinary practices and has taught at the NAVTA-approved Veterinary Assistant Program at the Harper College in Illinois. Deanne has been a Board Member of the Veterinary Emergency and Critical Care Foundation in San Antonio, Texas since 2011. She holds a BS in Anthropology from Loyola University and an MA in Anthropology from Northern Illinois University. 
Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy.