That’s because everybody comes up and pats him on the top of the head.
My son is about 5’4 and started losing his hair about the same time as you. There would be shedding all over. In the shower, his bed. He shaves his head too. My maternal grandfather and uncles We’re all balding. Husband has all of his hair. Crazy.
My older brother 66 at 5’7” has a mop of hair like Brillo. My younger brother 54 at 5’9” is a skinhead. Go figure. Me at 61 I’m the same height as the older bro, with less hair but not bald either.
Fortunately, my wife encouraged me to start shaving because I had been using clippers to cut it close - she thinks bald is sexy ;-))