Happy pre-birthday. Welcome to the club. We have cookies.
And the "back in my day" stories are fun because with the right audience -- you get the joy of watching them swallow an absolutely ludicrous lie while rejecting an honest truth.
It's the same reason school teachers deliberately screw up current slang (or pop culture references or memes), just to watch the confusion and cringing responses from students.
Students who aren't aware that their teachers are laughing their asses off in the break room, and might actually have a prize for whomever gets the best response.