I am getting close to the old fart age. I asked my Italian Barber, Sam, about shaving and he said the only time you shouldn't shave is when you are "dead" otherwise you should shave.
For him it was a discipline that meant you still cared about the whole "routine" of living......sorry to be philosophical. This is a guy who was a barber for 64 years who came from Italy and never owned shoes until he was a teenager. I listen to him as my troubles seem pretty small. His favorite meal was a sandwich made with slices of raw horsemeat which he said gave him energy. Seriously, I''ve eaten duck tongues and bugs are not a problem eithger but that was way over the top.
The other thing he taught me was that with age WISDOM does not come. Listen to young people as their brain engines are still firing on all cylinders.
Therefore, Shave everyday even if it's just to kill time.