As you know Characters are a certain age but then they are some who have an age that cannot be figured out. But they are as old as recorded history or hell even older.
Futurama and Transformer Universes commonly have this
Nibbler's race was 17 before the Big Bang and their foes the Brian Spawns were born right after it
Bender using a one time travel to steal things from the past, he does it one at a time and is perfectly happy waiting the time out he did this many times to the point of there being hundreds of him at the end of the First Futurama Movie meaning he's a millon years old minimum