Not age, thank goodness. I'd never want to do the teenage years again.

Sixteen years ago I woke up in Orlando, Florida and wondered what the hell I'd agreed to.
I do solemnly swear that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. So help me God.

Four more years left, and I still mean every word of it.