I had SRS at the age of 64. I have been lucky to have had few risk factors due to age. Things like diabetes, heart disease, or smoking, can increase the risk of surgery and make healing more difficult. In my case, I did everything to be in best of condition prior to surgery. I needed it, having two post-op complications that made my recovery difficult.
If you're unsure if you're healthy enough, your doctor can go over surgical risk factors with you.
Good luck!