hhmm.... that's a hard one. 99% of my bettas are pet store bettas. i know Zach, my first betta, stayed with me around 4 years, so he may have been 5-6 years old. he was an orange dalmatian Veiltail. :d Cup, my most recent lost, was around 2-4 years old. his fins were HUGE, and he was with me around a year. everyone else is still pretty young. i know for a fact my Chappy Belle(a marble dragon HMPK) is exactly one year old. :3
i hope i get to watch Chappy grow into an old lady. x: she's my youngest betta! she turned one year old around the 4th of July. she was one month old when i got her, about a week after the 4th. i enjoy knowing exactly how old she is. :3
All my bettas are from pet stores, some were saved from a bad fate and some I just loved at first sight!
Azure is my oldest- roughly 2 and 1/2 years, Cleo and Demon were next, sadly they both died a month from each other quite recently, they must have been a year or a year and a half. Then came Peaches, the spunky girl who kept wiggling at me lol! She's almost a year probably... My saved babies are Sterling, Tranny, Beeuty Qveen, Beefcake! and Kamikaze, they're brothers and sisters all probably 4 months old, very tiny.. 1-1.5 inches, not counting fins. Little Blue Boy was also their brother but never had a chance at life. Last is my Hm boy who I saved from a bowl of brown water and who is still recuperating.. He's probably a year old by the looks of him... Possibly less.
They're all VTs except for Sterling who is a DT, new boy is a HM and Cleo and Demon were Crowns...