“I just don’t have the energy I used to”. I hear this a lot from
colleagues and friends. I even feel like that myself from time to time.
While I think I know what they are saying, I don’t actually know what
‘energy’ is. At least, I don’t know what the term means in the context
of growing older. I can definitely distinguish the feelings I associate
with moods as a kind of ‘energy’. When I’m excited, challenged,
interested or committed, I seem

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