How to Grow Old (1951)
This is nice and I like the advice to not dwell on the past.  I can see the temptation to do this as I grow older.One sentence, though, I disagree with is "One’s thoughts must be directed to the future."  I understand what he is saying, but I think better advice would be "One’s thoughts must be directed to the present."  His main advice seems to be to find something that interests you enough so that you are happy to do it every day - to me, something like this keeps you focused on the present and not the future.