Psion
Adventurer
Would it ruin the game for you if all races had lifespans similar to humans (80-100 years)?
Balance-wise, no.
Flavor-wise, IMO yes.
Indeed, they shortened the lifespan of elves, dwarves, and gnomes between 1e and 3e, which never quite sat right with me. Unless you do some sort of "you play your character until death and then start new characters at 1st level" thing, lifespan of a PC race is largely inconsequential except as flavor. So nerfing it for balance purposes (which is the only reason I can think they did it) strikes me as a bit pointless.
If you are doing it for you OWN flavor reasons, I really don't see the problem.