Life after HT with no recurrence would get pretty much back to normal - a significant proportion of the side effects are reversible (muscle tone can improve, fatigue dissipates, libido usually returns, erections can be regained (if penile health has been maintained throughout), etc. Some side effects can be permanent, like penile atrophy or man boobs.
Life without HT - it is purely guesswork and will vary for each man but my father-in-law refused any treatment that would affect his sex life (although 79 he had a wife 20 years younger) and he went from T2 to dead in 4 years. The cancer spread to his liver & kidneys unnoticed and he was walking around oblivious to all this until 24 hours before he died.
If (not when) the cancer was to recur after salvage RT/HT, almost all of the alternative treatments are different forms of hormone suppressant so life would be fairly similar to now for a long time. There is plenty written on here about life on chemo - some cope fine and carry on working throughout while others are knocked sideways and in extreme cases, can die from infection.
Work on the basis that salvage RT/HT is going to be successful :-)