So, this man is in his 70's, married, okay for money, no specific health problems. He doesn't seem to me to be depressed.
However, he has no enthusiasm for anything - doesn't want to travel, visit family, nothing. Reads and potters around the house. He says he has nothing to look forward to except declining health, both physical and mental. He says he really doesn't want to live anymore. In my opinion, he dwells too much on what he can't do, rather than what he can.
Does anyone have a guide to "maintaining enthusiasm as you age", or something similar?