I always like to see how long I can keep them alive. I usually get Otokitchis ^.^ The oldest mine has ever been was 39. I have two old timers right now but one is on pause and one has dead batteries.
I really like the Old Timers! I like raisisng my Tamagotchis until they get old, too. Plus, the old timers can have the "little Japanese man" character when they reproduce. Grr...what was his name again? I used to get him all the time. I'm going to look this up.