Beyond getting things done, I read recently that older, experienced developers shape culture. It is really true, and I didn't realize it until recently. You have much more obligation when you are older to act in the way that you want your team to act and approve what you think should be approved. You are usually a mentor and role model whether you want to be and think you are or not, and you can't just work hard and that rub off on your team; you need to show them how to help themselves rather than do their work for them, otherwise you're setting yourself up for problems.