Surviving your forties

If you are a parent of adolescent children, Dr Phil will tell you your job is to get them through to adulthood. But what is your job re yourself? Given that by now you have realised:

a) That you cannot be fixed
b) Nothing helps

what to do with yourself? When someone has written this guide, please send it on to me.
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And further...the more I do to stave off the thought "I'm inadequate", the more inadequate I feel.