Aging a Valuable lesson

I have been trying to unpack and get settled, now that my belongings are finally here.  Everyday I find myself saying aloud "I am too old for this".   When I get tired walking the trails, I remind myself it's because I am old.  When I crawl into bed before 10 pm I think to myself, get your rest - you're old.   Today, I met a college campus Veteran Program manager who is 82 yrs old.   He recently had back surgery but still walks to work everyday.   Not only that he hikes regularly--going to the bottom of the Grand Canyon several times per year.   Last weekend, he married a "younger woman", 81 who shares all these activities with him.   Absolutely amazing--I am counting the days until I can retire and he is living every day to the fullest.....apparently it is not the number but the attitude--hopefully I can learn this lesson!!!