Goober and rebooG:
Goober ages as normal and has a pretty good life, and he dies at 40, because of his body just slowly deteriorating, but once he dies, rebooG takes over. Once rebooG dies, Goober is reborn, and rebooG is sent to Blackspace until Goober dies.
Big Guy: Dies old sleeping in a shopping cart.
Boberston: Can't really die cause he's like Bob.