The 3% of men are on TRT is not my estimate. The one third of them going through an GP/mainstream medicine is. I suppose an actuary could figure it how many, but that is beyond me.
We have insurance claim data, and we know how insurance companies look at TRT, and pharmaceutical company data. TRT clinics are booming, but that is cash with no claims. Compounding pharmacies might be able to track prescriptions. Then you have the underground sources, which I think are significant but impossible to track. I also think more men then ever are looking at TRT. I am not sure mainstream medicine will get on board.
I’m surprised your father was given testosterone by his PCP. Hope it helps his quality of life.