That's exactly my situation — I was diagnosed with oligometastatic prostate cancer to my spine at age 56, 2½ years ago, and am on ADT indefinitely — and I feel that I'm living a pretty-great life.

The side-effects can be occasionally annoying, but the extra years are priceless.

(In my case, though, it wasn't just a speck — it was a big lesion that compressed my spinal cord and left me paraplegic for many months, so there was no doubt about the scan.)