Do you know why single men are skinny and married men are heavy?
The single man goes to the fridge, doesn't see anything good, so he goes to bed.
The married man goes to bed, doesn't see anything good, so he goes to the fridge.
Here is a tip for you: if you marry someone who you love, and excites you when you are young, the person you married will still excite you when you are old.
The Bible mentions this, sorry I can't remember the verse, something like "cleave to the wife you have when you are young."
It's true that when you are "middle aged crazy" you may not be turned on by your spouse -- this advice works for young people and old people, but middle aged people are a different world.
If you want to be one of those people who still loves the person you married even when you are old -- marry young, marry someone you love, marry someone who turns you on. And stick with it, and never stray.
I think its more because their wives love them and make sure they take care of themselves. Men are more likely to pay attention to their appearance and their health to make the woman they love happy.