How are you living to avoid regret in your old age?

I believe that some of the most common regrets that our elders face are not having lived up to their potential, and not helping enough people. (Bill O'Reilly brought this up at the end of The O'Reilly Factor last night.) Do not waste the precious time that you have on this earth. Make a difference; either in your life or somebody else's. You don't want to lay on your deathbed with any regrets.