Age 74 with 2 cores 4-3 and 2 of 3-4 out of 30 cores from my 120 gram prostate. PSA 2.9 PSMA Pet scan said all confined to the area of the 7mm lesion on one side where the MRI Fusion Guided Transperinal Biopsy was done. I was at Mayo Phoenix and had the 5 treatment proton radiation with almost no side effects at all and it has been 121 days since my last radiation treatment. My urine flow even feels like it is a little better. The only side effects were about 5 days after the last treatment I had a very slight pinkish discharge before my morning bowel movement for three days. I did have the SpaceOar Gel inserted. The biggest side effect was after the 2nd radiation treatment session. After the first treatment I had my insulated mug of coffee waiting for me in the car and I drank it on the drive home and finished the pot when I got there. I did the same thing after the 2nd session even though they warn you to avoid caffeine. About an hour after I finished the pot my bladder said, "you dummy you should have listened". I had to pee about every 15 minutes weather I had anything to pee or not. Needless to say, I avoided coffee for about two weeks after my last session. My 3 month PSA check was UNDECTECTABLE! Good luck with your decision but I am thrilled with mine.