"What's a dust mop?

I laughed until I hurt J's feelings. She said she had to go home and sweep the floor and clean out the refrigerator. After she had commented on what she had to do three or four times and since there are five cats in the house, I asked, "Why don't you dust mop the house?"

She was truly puzzled, "What's a dust mop?" I could barely drive for laughing, and laughing! Every time she asked, "What's a dust mop?" I started again, incontrollable laughter.

Finally, she was hurt. "Why don't you just tell me instead of laughing at me?" "Do you mean like a Swiffer?" Sorry, but that made me laugh again.

Am I so old I am using out-of-date technology, so old a grown woman has never even heard of it? Should I trade in my horse and buggy for something more modern?

When I finally told her in a moment I could manage not to laugh, she said, "Oh, one of those?" No, she had never seen one, never, ever! I think she is still hurt and mad at me. Part of my laughter was a sort of "OH, no, I am old, what a faux pas that discloses my age."

Your turn
Has anyone ever NOT known what something was that you thought was common knowledge, not old-fashioned, not esoteric knowledge? AND, did it make you feel sooo old?