How long do betta fish last from Petsmart?
Betta fish can live up to 3 years old.
How long do store bought bettas live?
The short answer. The average Betta fish lifespan today is around two to three years. However, since many Bettas you get from pet stores are at least already six months old or more, you’d be very lucky to keep yours for two years.
How old is a full grown betta fish?
Betta fish are considered fully developed once they reach approximately 7 months old but can grow larger depending on their environment and care. If you purchased your betta from a pet store, they are generally between 6 months to 1 year old.