Medical sources say more than two-thirds of cis men will experience some form of hair loss in their lifetime. Once I started to look into it, however, I realized MPB is actually way more common than you might think. I knew other trans folks - guys who had begun their transition around the same time I had - who were now completely bald. But my hair had always been so thick and curly in my youth that the possibility had seemed like a remote one. Of course, I had always known that losing my hair was a possibility.
However, by year 10 the thinning near my forehead became too apparent to deny and I finally had to face the fact that I had succumbed to the dreaded MPB (Male Pattern Baldness). The changes were slow enough at first that it was almost imperceptible. It wasn't until I was about 8 years into hormone therapy that I started noticing my hairline was shifting.