You are in a very similar situation as me. With our age, and size of our AN, we can choose any of the 3 options and not be "crazy" for doing so. It's frustrating because there is no clear choice, but the reason the choice isn't clear is because we have 3 good choices.
Right now I am continuing observation. I had my 6 month MRI and it showed no growth, so I will have my next one in a year. In the event that I end up needing treatment, my mind (for now) is made up and I would do surgery. I think the older you get, the more appropriate radiation is. But, according to my Dr, 47 is still "young". 52 is young too (congratulations
)
Anyway, I am not trying to say what you should do, just explaining what I am doing, and giving my opinion that I think you are on the right track to be considering all the options as they are all viable for you.