Doing it because you want to. Doing it because of its own rewards.
I heard an interview awhile back with a former NHL player talking about parents who want their kids to live the dream and make the NHL. He said something to this effect. "If the kid's head is not in the game, no amount of training is going to help". And, that is a decision the player makes for himself. Parental pressure isn’t going to do it.
If you are a mature adult musician who has stuck with it for decades you are intrinsically motivated. The question at our age is often, “how do I stay fresh and excited about what I’m doing?”
A list of thoughts:
David Story: Professional pianist, drummer, composer, and educator. Well into his 5th enthusiastic musical decade, David works with adults pursuing musical dreams in the autumn of life, while he maintains an active presence in the Toronto arts scene.