Joy, my dad had prostate cancer a couple of years ago. I guess he was around 67 at the time. He had surgery (recovery would have been a snap but he insisted on getting back on his bicycle before being fully healed) and then radiation treatment. That was done each day for several weeks. He responded well to the treatment and is now fine.
I am hoping the same is true for your DH. Make sure you tell him, no bicycle riding before the doctor says it's OK!
With my prayers