Hello Anthony,
I usually try to check this site everyday but I missed your message as I had a busy weekend. I am 57and I had surgery last May when I was 56. No matter what you choose, staying in shape is your best defense. I stayed as active as possible before surgery even when all I could do was a treadmill with hand rails because of such poor balance. But after surgery, and after I regained my balance back I started training again, and 6 months after surgery ran a 28 minute 5k. So your running days are far from over, and would be your best course for your recovery should you choose that option.
Now that being said, Dan has a great result from cyber knife, so the choice for which method you go with is really up to what you find the most comfortable for you. Weigh the options, make a decision that you think is right, and stick with it, regardless of what others think.
I'll be glad to answer anything I can, but know you have support here no matter which direction you choose.
Mark.