I am 75 and have always been active. I have been on lupron for seven months and I have experienced very few side effects. However, despite weight training several times a week and cardio every other day on stepper I can not maintain any muscle tone. It has been very discouraging. Considering terminating ADT treatment at 10 months.
The good news for you is that every patient displays different side effects and hopefully you will experience only minimal muscle atrophy.