Happy Birthday Guy! You're 23! But, I guess you knew that already, old man. Anyway, to help you get your head around the ramifications of this event, and to keep your chin up during the initial denial and confusion stage of the transition [cheer up! I'm sure you'll be comfortable with your 23-ness in about 8 months], I think it's pertinent to recall the bon mots of an admired wit. Quoth she:

"I know! 23! That's like, almost 25, which is almost mid-20s!"