A Tamagotchi Connection (any version) will not die of being too old.
The oldest Tamagotchi character I've ever heard of was Aaron, raised on a V3 by Kyliesmum. He died at age 145, on Aug 7, 2006. You can read all about it here: https://www.blogagotchi.com/kyliesmum2/
Tamagotchi's only did if you leave them alone until they die but how long it takes is weird because some tale over a day to die, other's takes like 5 hours or something.
Tamagotchies can live forever if you take good care of them. I had a Otokitchi called Heidi, she lived way over 99yrs! I reset her because she woke up to early each day at 7:00am! And i got bored of the same character.
Hope i helped, and have a great tama-talking day!!!