Yes, in fact I think the 15 yr outcomes for surgery and Cyber-Knife are identical. So 15 yrs out, if you are still "cured" or if there is recurrence, it doesn't matter which option you chose. At age 76 that puts you at 91 yrs old - IF you live that long and don't die from something else first.
5 Visits of cyberknife treatments offer a lot fewer complications than does surgery, but ultimately it's your choice and you have to be comfortable with the decision. Best of luck!