Bridegroom is 85 bride 25

At 85 years, Morris marries a lovely 25-year-old woman.
Because her new husband is so old, the woman decides that on their
wedding night, they should have separate bedrooms. She is concerned
that the old fellow could overexert himself. After the wedding
festivities, she prepares herself for bed and for the knock on the
door she is expecting.

Sure enough, the knock comes and there is her 85-year-old groom ready
for action. They unite in conjugal union and all goes well, whereupon
he takes his leave of her and she prepares to go to sleep for the
night.

After a few minutes, there's a knock on the door and there old Morris
is again, ready for more action. Somewhat surprised, she consents to
further coupling, which is again successful. The octogenarian once
again bids her a fond good night and leaves.

She is certainly ready for slumber at this point, and, after a few
more minutes, is close to sleep. But for the third time, there is a
knock at the door and there he is again -- fresh as a 25-year-old and
ready for more. Again they ravish one another.

As they're basking in the afterglow, the young bride says to him, "I
am thoroughly impressed that at your age you have enough juice to go
at it three times. I've been with guys less than half your age who
were only good for one time. You're a great lover, Morris."

Morris, looking quite confused, turns to her and asks, "You mean I was
here already?"