An oldie but goody ... just in case there's a rare person here who's never heard it before..
A 90 year-old man goes to his regular doc for his yearly checkup. The doc compliments him on his remarkable good health and condition and asks him if there have been any significant changes in his life over the past year, and the elderly man breaks out in a huge smile and says, "Well, Doc, I found a woman who absolutely adores me who is 23 years old, and I married her last week!" The doc replies, "Well, sir, congratulations.. I'm very happy for you. I must warn you, though, that, with people your age, sex can be dangerous and even fatal, so please be careful." The old guy replies, "Thanks for the warning, Doc, but hey... if she dies, she dies!"
And...
A different 90 year old guy, in much poorer health and pretty frail, was walking in sub-zero weather, coat drawn up around his chin, hat smashed down over his brow, teetering around a bad section of downtown shivering. A "working girl" approached him and said, "Hey, old-timer, how about some super sex?"
He broke into a smile and gratefully said, "Oh, honey, that'd be great... I'll take the soup!"