Hey, in end-of-world situations, sometimes humor is the only thing keeping you together.
As for age, I decided on Cade's a while ago, though I could have sworn I made him older than is listed on his sheet.
I don't know how old anyone else is, though, since most haven't listed it. We're just going with "really old." Marlowe is the youngest I think, though, despite the fact that he is simply displaced from the normal flow of time, as I understand it.