I have felt aging interfering with everything I do.
For 60 + your are doing way better than many 20+. I think you are pushing yourself too hard.
Maybe slow down a little and enjoy what you are doing.
If I had 1/1000 of your skills and precision I would be happy.
I think the whole problem is the French; they tempered with the veneer -:)
C’est la vie mon ami.
Abbas, Castro Valley, CA