It's hardly flattering for a woman born in 1965 to be compared to a man born in 1949! I think there is something in common between them, and that is the devotion to maintaining a lean and toned body... it is conspicuously true that Iggy Pop has a very lean physique - he must have a very low bodyfat percentage for someone who is not an elite athlete. What he demonstrates, though, in many recent topless pictures, is that however lean and toned you are, the sheer age of your skin means it will sag.
Ignoring whether or not there is a likeness to IP, how his body looks now should serve as a warning against going so far down the road of the lean and toned physique route... eventually age catches up regardless. Toned is good at any age, and is very beneficial to you as you get older (I am not practising what I'm preaching yet by the way... though I do aspire to be more toned), but the leanness needs to be moderated - body fat is there for very good reasons and too little is bad for you, just as too much is.