Near the end of “Keith Richards: Under the Influence,” a new documentary about the Rolling Stones icon, the film’s subject offers a bit of his ironic humor.
“I'm not getting old,” he says with a glint in his eye. “I'm evolving.”
It’s an apt bookend to a piece that starts with the guitarist, walking through the very un-Richardsian precincts of a peaceful garden, remarking with a kind of hard-won wisdom that personal growth continues "until the day they put you six feet under."
Age and mortality are much on Richards' mind in the film, though you wouldn’t know it by looking at the musician, who at 71 is as...