The last generation that cared about this in any big way were the Xers (and close to X-er boomers) circa 1990s.
And even them, not enough, and not as a majority. But at least many techies back then did.
For example very rich people in the US receive vanity SSNs. Ghislaine Maxwell has one that spells out "Leet Babe". It's like number plates to show off.
"Ghislaine Maxwell's Social Security Number (133-78-4883) is recorded in U.S. law enforcement documents, such as historical NYPD files, as part of her official identification and background records".
1337 84883 --> LEET BABBE in leetspeak.
It's a stretch, but to be fair, apparently they already had no problem getting visas and other documents with 3-4 variations of their names (to make database lookup more difficult)
The vanity SSN thing looks even weirder because someone who I assume was Epstein's great-grandfather was head of US social security administration in the 1920s, a crazy coincidence [Trump family was more department of agriculture]. The 133784883 SSN is clearly a five-eyes meme and one day FOIAs will show what other interesting VIPs have a 1337-range SSN.
Even Donald Trump's officially-curated Wikipedia lists some of his fake identities, and he has some Epstein-related pseudonyms which are not widely known yet which are miraculously also associated with the Kashoggi family name.