Quick Betta Question

I bought a red Betta male for my then under 2 year old grand daughter who was visiting us one summer. The fish was left with us after the visit and we didn't think it would last long in the small bowl it was in. It's now 2.5 years later and that fish is still vigorous and thriving! At the time of purchase the fish was fully finned and brilliant red. He's grown longer finnage and his color is not as bright but there are no signs he's giving up the ghost soon. I know nothing about these fish and I'm wondering how long these guys live? My grand daughter has been back to visit twice since Shi-Shi the red fish came to live with us and now expects her fish will always be here. Thanks, Elapid

 

Thanks Aquaman. YES on the beginner fish. This guy lives in a little 2 pint bowl that sits on a self in summer and on top of a heated Japanese tea water dispenser in winter, weekly water change from the tap (untreated well water) and has had nothing but the tiny betta pellets to eat and not much of that. He has never been sick or diseased or refused food; he's very curious, aggressivly flares and displays with gorgeous finnage. I paid a couple bucks for him and his food cost is negligible ... Is there a better beginner fish? Elapid

 

I'll see about how to post a photo and do so. Elapid