I forgot that there is a particular enjoyment in the journey. I think you wife's comment, although it hurt you and has caused you to consider if it is the ultimate truth was not made with that intention. I don't want to be graded anymore. Playing the odds, I'd bet no. You can redefine, and become more satisfied with your sex life at age 80 and after 50 years of marriage.
Humans have an amazing capacity to learn and grow.
It's when we consciously fight that learning process that things get stale, and hope diminishes. Either that or some catastrophic event makes you braindead. The Lessons Children Learn. How the Co-dependency Movement Is Ruining Marriages. How to Find a Good Marriage Counselor.