imo ....The key to prince's longevity lies in him TAKING CARE OF HIS INSTRUMENT. And by that I mean his body, he's healthy. You can see it and hear it....by not getting caught up in drugs and ish like that and remaining interested and aware of things outside his own immediate sphere.

Prince's longeveity is also due to his ability to be master and student simulatneously...and being unafraid to do whatever the hell he wants, whether people like it or not.