In 1955 I read a book by Sloan Wilson called "The Man in the Gray Flannel Suit" and I remembered a line "A Gentleman always trims his hair every 10 days" and from that point on I did that---well, maybe every two weeks--because I wanted to be a gentleman!
I did that until about 1999 when I decided I was going to stop having my hair cut. It's that 'getting old--going bald" syndrome most men go through which is why you will see men with long braids going down the back of their neck! It got very long in the back until it reached the point it was a pain to take care of so I made the decision from that year on that I would get a crewcut twice a year and, more or less, I have stuck to that schedule. I would usually get my hair cut every March or April and then every September or October and today was that day!
Now about the beard--I, also, decided when I retired I didn't want to shave anymore and so I went through periods of a full beard, partial beard, Van Dyke beard or no beard. I am now at the point of no beard but am experimenting with a thin beard on the sides of my face but it's not really coming in as I want it so-o-o-o-o-o- o-o I am thinking of off with the beard BUT the mustache stays!!