I've had this conversation more times than I can rember:
Other person: Mike, don't take this the wrong way, but how old are you?
OP: Oh, shit, you're still just a kid.
There's an unwritten rule that anyone under 30-years old is still just a kid. So today, as I turn 28, I'll reflect on my two years of remaining childhood.
UPDATE: Kip is also having his last hurrah. (Well, I think I actually have two hurrahs.) Then again, perhaps 40 is the new 30?