It’s so neat how different cultures adapted to numbers. Like French have something like 4 times 20 (and?) 2 to mean 82. In Hungarian if you say billió, that is one trillion rather one billion. We riff on the ending of million to express billion: milliárd.

As someone else said, they probably kept the original age bracket. I’d say it’s at least 5-6 years out of whack. Early Ys are starting their forties, late ones their thirties.