I think a magazine test should do the trick. I got some Penthouses still in storage from over a decade ago. They still get me riled up.....but so does the right sorta breeze. If you can still spank it without the talky videos then your probably alright. Heck I can still use the ole minds eye in an emergency. Lol.
Hell married for 8 years with 2 kids and both of us working, we still find time to get on a couple times a week....then I take care of myself another 3 times on average and we're good to go. Sounds average for a young/middleaged fella.