The real metric of success isn't the size of your bank account. It's the number of lives in whom you might be able to make a positive difference.
Just as physical exercise is a well-known and well-accepted means to improve health for anyone, regardless of age or background, so can the brain be put 'into shape' for optimal learning.
My children have been learning lessons about entrepreneurship since they were in kindergarten, and these lessons are paying off: even though they are only 22, 18, and 15, they have already collectively launched three nonprofit organizations and several new businesses.
We begin to change the world when we stimulate long-term prosperity using technology. There is not a problem that's large enough that innovation and entrepreneurship can't solve.