At the dinner table, I mentioned having read in the paper that ABBA were at the top of the Hit Parade. Blank looks from my 17 and 14 year olds. "It's in the paper: they're at Number One."
Son starts laughing uncontrollably: "You mean top of the charts - number one in the charts. I thought you were talking about one of those parades of wanted people."
And daughter added: "What does 'Hit Parade' mean?" As soon as they got down from the table, they, still laughing, began to text the story of the latest thing their fossil father had come out with.
I then mimed "grumpy old man" for a couple of hours.