Is it normal that i seek sex with only post menopausal women as a young lesbian

I'm 26, but every woman that I've had sex with in the last 4 years has been age 54 to 76. They all either have children or grandchildren my age. A couple of them are married. Almost all of them have had a high sex drive and I've been able to make them orgasm many times. Some of them are astonished that a young attracted woman wants them. That probably has something to do with them having many orgasms. I don't know all of the reasons why, but being with them excites me more than young women. I do have issues with my mother, and I know that may have some bearing on it.