Annual prostate exams should be done for everyone over 55. Early detection saves lives. It doesn't mean the end of your sex life.
Old age and prostate surgery has taken it's toll on erections for penetrating sex so masturbation is the only alternative but with a limp penis. Even that is not very satisfactory for a couple of senior citizens that have always enjoyed a healthy sex life together and solo.
One night, while I was teasing my wife's clit and playing with her nipples, she began to massage the head of my penis. She also found that if she tucked it back inside me, it formed a sort of vagina with a clit. With a little bit of lube she showed me how to play with my new found 'clit' the same way she does it, lying on her back with her legs squeezed together teasing her clit with her fingertip circling the sensitive spot. As I tucked my penis into my groin in the loose skin, I was able to get one or two fingers up inside me up to about the second knuckle like I would be when I am in her vagina. It felt sooo good and the mental image of having my own vagina and clit just added to my pleasure while my wife was doing the same for her pleasure. Then she reached over with one hand and started playing with my enlarged breasts (another result of reduced testesterone) and tweeking my sensitive nipples.
It was not long before I felt the pressure (pleasure) building and my 'vagina' got all wet. She continued to masturbate while I came down for my high and and I snuggled to her breast to let her know how much I loved and appreciated her.
The only thing my wife didn't teach me was how to have multiple orgasms like she does.