Interestingly, I find the interviews more compelling than the concert footage. For one thing, they avoided playing any songs from Raw Power, which to my mind is the strongest Stooges album. [Update: I just now see from an Iggy docu on the disc that on the third album, the Asheton brothers were not there. I don't know how they could call it a Stooges album. By the way, Ron Asheton just died in January of a heart attack.] [Update: according to wiki, the Ashetons were actually on it. Odd error in the documentary.] And in extension of that, I don't think Iggy is the greatest song writer on the planet, all my favorite records of his were done in collaboration with Msr. Bowie. (Bowie produced Raw Power. Iggy claimed he ruined it, but see what a classic it became.)
I am sure the girls still love Iggy, even at sixty. His stage persona is as kinetic as ever, he is fit, and he's continually fighting the tendency of his trousers to fall down. (I don't understand why he doesn't just buy a belt or suspenders...)
I always find it interesting when an artist manages to still be on top after 40 years. That's just a super-human accomplishment.