I just yesterday returned from a trip where I photographed a woman with two children whom I photographed first when she was the age of the older of the two children.
I think that age as a number is not nearly as important as health. You can be in poor health and be pretty miserable at 40 or 50. If you're in good health you can enjoy things into your 80s.
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You live in a deranged age more deranged that usual because in spite of great scientific and technological advances man has not the faintest idea of who he is or what he is doing.