You definitely can give back at anytime. It's up to you, and some people are always doing it.

My definition isn't success, but it's a question of focus. Many people when they're younger are focused on growing their career, getting ahead, trying to increase their income. While you might never stop that, I think as you get successful in your field, whatever that means, you at some point stop and look beyond yourself a little and see what you can do to help others.

Some people take action here, some don't.