Phill became 60 years old, this step is just him taking a smaller role while he can educate his replacement until he decides to retire (which is certainly financially possible for him to do after he becomes 65).
"Mr. Schiller owns over 69,491 units of Apple stock worth over $18,846,432 and over the last 16 years he sold AAPL stock worth over $73,528,915."
I believe I'd enjoy any role like that, if I'm skilled enough to tackle the problems I want to while having a trusted team which I can delegate things I know how to do but don't want to.