Hi Alex,
Unless you are going to be on HT for life (not likely given your current diagnosis), I'd suggest that worrying about the side effects of HT is not quite the right focus for you at this stage. What you need to be trading off, in considering your treatment options, are the potential consequences of RP versus RT. In the medium to long term, these are the things that matter most. HT is a short term and transient proposition - not least because its effects will decline once you stop the treatment. As others have said, both here and in other threads, most people get through HT with side effects which are inconvenient rather than life changing.
It has no statistical value to you but I am pretty much your age, and my own experience of being on Prostap/ Zolodex for 30 months, including 9 months double banking with Bicalutimide, has been that while I notice hot flushes, bits of tiredness, about 10% off my running times etc, no one else, including my 5-year old grandkids, sees any material difference. Loss of libido is an issue, of course, while testosterone production/take up is inhibited.
Navigating the treatment options facing you is hard going. We have all been there. But the critical thing in making any decision you can live with is to stand back a bit from all the emotional stuff and the noise, and try to get a sense of perspective. I would sort out the big choices first, and only if it's a close tie would I think about adding the shorter-term variables to the calculation....
Best of luck