Its interesting that as brain development goes, 23 is a magic age. Ask the auto insurance underwriters. Then 26-28 happen when you start to get the hairs on your shoulder, not a patch...just a bunch of individual hairs (unless you're Italian, in which case you've probably already dealt with these since 13). Then, after a really fun weekend, takes a few days to recover from the fun you've had. Oh, and hair...some are lucky some are not. As far as social development--all were raised and taught well, others not.
...and some just like the anonimity of the interwebs.
I wish my wife would ride with me--she'd look smokin' hot in lycra. She'd think otherwise.
+1 to what merlinextralight wrote.