Senior Moments?

My grandmother - my mom’s mother – and I have been having a sexual relationship for the last four years. I am twenty-eight and divorced, and she has been divorced for eighteen years. She is very attractive, trim, with silver hair. We had always gotten along and it really stared out with the two of us flirting and joking around and teasing one another. Then one day we worked up the nerve and decided to try it. It was wonderful. Neither of us were expecting it to be as wonderful as it was, but we both loved the incredibly intimacy of that and how special it was. Needless to say we didn’t stop.
Now we have basically been having an ongoing affair. My mom has no idea of course nor does anyone else. I know that this May-December relationship would probably sound bad enough to many, and add in the fact that it was with my own grandmother, would really throw a monkey wrench into the works. But the thing we are both thrilled and happy and are having the time of our lives.
I can only say that I suspect that I am probably not the only grandson to be enjoying such a thing with his grandmother, and my thinking is – why not?