We have a five year old crayfish. He has molted twice and lost one of his claws the last time. Fucking thing won't die.
I pet sat one once while a friend went away for a week. It was old and she was very attached to it and I was terrified that it would die on my watch. I mean I could have just bought another one that looked like it and she probably wouldn't have known the difference but..
get another betta male. put the bowls next to each other. they flare up and are ready to fight. beautiful fish. not so much after a fight. they bet on them in thailand. they have some nice tanks for them these days. i may have to get a few. i gave up on large aquariums. i'm too lazy. https://www.amazon.com/s/ref=nb_sb_ss_c_0_6?url=search-alias=aps&field-keywords=betta fish tank&sprefix=betta fish tank,aps,201