I Became a Great-Grandfather Yesterday

Somewhat ditto. We had our older son when I was 30 and he was at the end of his 30's before having his sons, so I'll be hitting my 90's before they get out of school let alone marry.But at least my in-laws got to meet their great-grandsons.

Just a wild guess on my part that it's a cultural reference:

Garrison Keillor, Prairie Home Companion:

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And that's the news from Lake Wobegon, where all the women are strong, all the men are good looking, and all the children are above average.

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Better than our family trait from my father's side: love of beans.