Did he maybe over-rev the valvetrain with Peruvian Marching Powder ya think? ‘Jus sayin’, as a cohort that generation was pretty hard on the equipment.
Perhaps, but to be quite truthful, Mick has been a health nut once he got rid of those bad habits. My understanding is that, generally speaking, good habits replace the effects of the bad habits within a decade, and he’s been doing the good things longer than that.