"I know," the old man said, "But fifty years ago, we were probably sitting here naked as jaybirds."
"Well," Granny snickered, "Let's relive some old times."
Whereupon the two stripped to the buff and then sat down at the table.
"You know, honey," the little old lady breathlessly replied, "My nipples are as hot for you today as they were fifty years ago."
"I wouldn't be surprised," Gramps replied, "One's in your coffee and the other is in your oatmeal."