One more sketch from pre-Python days from At Last The 1948 Show, which was later revived for the Pythons. I think I like this original version best.

For some reason, the punch line is missing at the end. “And you try telling the young folk that today… and they won’t believe you”

Tim Brooke Taylor, John Cleese, Graham Chapman and Marty Feldman.

Thanks to YouTuber BritBox