It is so funny to hear this as an older person myself. Don't you know that an old person is only older in their body - in our spirit and our heart we are still just a child. I remember thinking this way about older people and now I feel so silly - I didn't know then that it was all in my mind and that older people are really no different - and guess what - we kind of like hanging with each other because we have gained a bit of wisdom and we have a lot in common and we also - hopefully - are now able to let go of all that silliness about perfect bodies and such and we now love each other for the real reasons. When I was younger I didn't want to hang around old people - and the idea of them having sex seemed kinda funny to me! lol
Someday you'll understand it is not such a dang curiosity that we have the instincts and desires that you do. Always look for the ten year old behind a persons eyes.