I forgot to comment on radiation issues. Others have given you some really great ideas. Proton radiation would be useful, The photon radiation is pretty close in side effects and also works well.

My brother at 77 had SBRT radiation and at 80 is doing quite well. That is the preferred technique for somebody your age. Either SBRT or IMRT radiation can take care of the problem. Either of those usually causes some urinary issues, but they can be resolved with Flomax for most people.