Well, first of all, let's post unaltered photo of Mick. And then let's concede that we don't know anything about Mitch's sex life, drug use, or whether he likes to rock 'n roll.
By rights, Mick and "Keef" should be long dead. The only reasonable explanation for Keith Richards' continuing existence is thats he's undead- a zombie. Charlie was the only Stone who led a relatively clean, respectable life and he was the one whom the reaper came for.
Mick and Keith look like lizard suitcases as this point. I will admit, however, that Mick does have a heck of a lot more oomph in him compared to McConnell - compared to a lot of people his age actually. Of course, he's not being weighed down by that huge turkey neck McConnell carries around.