“I see more and more people who make it to their mid-forties or beyond, and they’ve been very successful… They’ve done very well in their work and career, but in my experience, they end up in one of three groups.
One group will retire; they usually don’t live very long.
The second group keeps on doing what they’ve been doing, but they’re losing their enthusiasm, feeling less alive.
The third group keeps doing what they’ve been doing, but they’re looking for ways to make a contribution. They feel they’ve been given a lot and they’re looking for a chance to give back. They’re not satisfied with just writing checks; they want to be involved, to help other people in a more positive way… And they’re the ones who finish well.

– Peter Drucker