Why do these guys even bother in getting engaged at this point in their lives? Yeah like a 26 year old truly loves you for who you are 
Even if you're 65+ you still want a younger cooch!
And Dennis Quad isn't the archetypical 65 year old either, much better shape than many.
Probably much better cardio and interest in sex than many 65 year olds.
I'm not even 60 and i would not have neither the cardio, stamina, energy or patience with a 20-year old.