David, I had similar diagnosis as yours (4+3) three years ago at age 74. Urologist and radiologist both were insistent on ADT. I also had no spread and cancer was limited to prostate.
I decided to have proton therapy only due to all the potential effects of ADT. My logic was largely based on protecting my current quality of life at my " young age" with the understanding that there could be some additional risk of a recurrence in later life. A roll of the dice , no doubt, but three years later all looks good so far.
Not endorsing my decision for anyone else but only for me. Best, Ron