Preparation is all! Side effects with AIs, like nearly all breast cancer treatment, vary immensely. Some people manage OK, others have a hard time. Think positive but plan for hiccups. Your bone density is likely to be good ( I was 67 when I started, but my bone density was excellent). Lots of people never have vaginal dryness, and there are lots of ways of dealing with it. The main thing is that your oncologist can share information with you and respect your decisions. Mine doesn’t know of any research that says three years are better than none, or seven years are still better than five. The research says ten years, for some diagnoses, are better than five but again research says that many women never finish five years - no idea how many finish ten. I am still here, I’m well, active and happy. It’s not proof of anything but it’s still pretty special! Best wishes.