Intimacy is an important part of a relationship as a married couple. As such, I try to remind my wife of this as often as possible. You know, so she doesn't forget.
I'm 48 and my wife will be 40 this year. I think a couple times a week would be considered "normal". Our kids are young so that limits the free time available but we make it work.
I love my wife more than anything in this world. If it were not possible to have nookie with her I would be ok with it.
Think about reversing the situation> what if YOU couldn't perform when she wanted it ever again?