"Isn't it about time we began thinking about what kind of world we're going to leave for Keith?"
Here is one of the (120, 150, 200?) songs he wrote with Mick Jagger.
I usually use this version to show the young people how to enter a room like a boss* but after Mr. Jagger demonstrates that technique, Mr. Richards displays some familiarity with a guitar.
*One simple trick is backup singers.
Entering a room with at least three backing vocalists garners one immediate attention and respect.