Wife and I are in our latter 40's, and we started working out together over a year and a half ago. We pump serious iron five days a week, and we're workout partners (yes, she's able to 'spot' for me, and I throw some heavy iron). We also watch our diets, use a sugar substitute, etc. If I do say so, we both are looking pretty damned good........and it took work. However, speaking for myself, it's worth it, for I found myself looking in the mirror a couple of New Years' ago and didn't like what I saw. I just decided to do something about it and stuck with it. She joined me shortly thereafter.
......and we average well over 700 times per year, by the way......