could the fact that they're married and i'm not have anything to do with it? or is it just guitar that keeps us all young? 
I sometimes think that. I haven't had any of the stresses and strains that relationships, marriages and kids bring (on the other hand I haven't had the benefits either).
On the guitar thing, or for that matter having any hobby and sticking at it for many years, I've often thought there's a "clinging to your youth" element - and maybe it's literally true. Is it a good or a bad thing? I feel like I haven't really "grown up" compared with many people I know - they're no longer the person they used to be in any way, physically or mentally, whereas I don't think I've changed much at all (but maybe they think the same? :? ).
Then again, vast numbers of "mature" men behave like children over football matches every week. And even if they no longer try to play guitar or collect CDs, they find something else to waste money on. At least I've never developed "grown up" habits like alcoholism and smoking....
Or it could just be genetics. My dad's 75, looks much younger and has a full head of hair, most of it still brown. He's 2 stone lighter than me as well. Old git.
