Youth is the season of receptivity, and should be devoted to acquirement; and manhood of power--that demands an earnest application. Old age is for revision.
Successful people are usually more lively than those who are unsuccessful. The quickening of the spirit they feel comes out of their creativity, and success detaches them from the more rigid outlook on life - it puts them in the flow. So the shakers and movers, by their very nature, are moving faster, taking more risks, and investing more in the world than their less active counterparts.