His shape has improved since the tour started.
He isn't the skinny, girly-looking rocker from the 70s anymore, but compared to what he looked like during the Hall Of Fame performance in 2004, I'd say he's been getting a bit younger. Back then he was quite fat and it looked like he was struggling to keep the beat during All Right Now.
Maybe touring the world and rushing back into the studio to work on a new album was good for him.