My little dog Twig and I have walked several miles through this astonishing Sonoran Desert today. I find again that age does not enhance my ability to traipse around in the heat. Although not from a large or scientific sample, I have heard among those I’ve met over recent time who approach or exceed 70 years a similar commentary: Where in hell did the energy go? And the resilience and stamina and flexibility? We know where it went but somehow it never ceases to surprise us when we enter the landscape of decline. Twig is only 3-4 years old and ten pounds, but an intrepid hiker and I watch her with a modicum of envy as she moves crisply...

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