Are you kidding?
Not to sound like an a-hole, but, I've tried to play some of Pauls stuff. It's not that easy. "Forever" is a bitch to play, then, then try to doing it while singing. He also plays lead in "I stole your love" which the Distortion is nice and cutting for. (just my opinion)
I gotta have a ton of respect for people who can still be around making great music. Especially 30 years worth. KISS, Aerosmith, Ozzy etc... I know they use outside help to write songs too, but they gotta perform it.