"You couldn't be sixty. I don't believe it." This astonished pronouncement came from a woman talking to another while waiting for a yoga class to begin. I was nearby and was astonished myself. The sixty year-old looked about 40; she was trim and muscular and I knew from previous classes that she could stretch herself into yoga positions far too complicated for the rest of us.
"My birthday is next week, " the sixty year-old who looked forty replied. "But you know I have been exercising...


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