Bettas on average live 3-4 years. When you buy them from stores, they are most likely around 1 year old. There isn't a clear way on how to tell their age from what I know, but there might be.
cut them in half and count the rings! lol jk jk, but seriously, you can count on having them 1-2 years from their purchase date. they are full grown in about a year to a year and a half, anything beyond that it gets tricky to tell.
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