Mentally I'm still pretty sharp. I know I'm not as capable as my younger 20 something self, but I also don't binge drink or smoke a lot of dope anymore, and I've acquired a good bit of wisdom in the intervening years so I could probably trick a younger me.
Physically, I'm a mess. Fatter, slower, balder, more hair in undesirable places. You name it, I've probably got it going wrong for me physically. At least I'm disease free, but other than that I kind of view my asthmatic, near-sighted, fat with shitty knees so I can't really exercise body as a prison for an otherwise cool dude.