I know there are couples over the age of 50 and some into their 80's who still have sex. There are also those who don't. I'm in the latter category, although I'm gay. As you get older the nature of your relationship changes in various ways and how a person chooses to deal with it affects that relationship. For some, it's a change in their financial status, for others it's a change in life goals, and still for others it's sex. How the people in the couple choose to adapt dictates how the relationship develops or dissolves. My husband and I would probably agree that we are best friends; we love each other, we have similar tastes and ambitions, we have similar interests and I don't think we would ever want to be apart. We just don't have sex, because for us sex just wasn't that important. Sure, at the beginning it was hot and heavy, but over time we lost interest and agreed that if one or the other of us wanted to "see other people", we would end the relationship. We never did. There's something pretty spectacular about going through life with your best friend by your side, who you know will always be there for you no matter what. I'm happy for those people who continue to have sex after decades together. More power to 'em!