Quite honestly, how many people under 40 (or 30) keep learning and stay hungry? Many kick back, raise a family, party, ... There's a lot to life, and only so many hours in the day. If you're lucky enough to do what you like, and to have time to enjoy yourself (at work, or elsewhere), you're doing just fine.

If it happens to make a difference, so much the better. But you gotta keep up.

I am 30 and am constantly in search for more knowledge to consume. I intend to do everything I can to see that the quest for knowledge never ends.

Whether it be programming, other technical things, art, language, various books, or any other skill... I don't know why anyone would ever stop.