Certainly, as one ages, one becomes more conscious of the shortage of time and energy; what really matters is how we make use of the time that is yet available to us and find ways to build up and conserve energy rather than lament the lack of it. Recklessness and haste are the hallmarks of youth; as adults, we may regret things we did or did not do while we were young. As elders, we may look back at our middle years and wish we had planned for our senior years more prudently.