[SandyAndyPerth]

As I just posted in a thread https://dev.to/mdchaney/cobol-dates-may-20-1875-and-disinfor...

Nobody in this HN thread has used the word "sentinel" - see another HN about the concept https://news.ycombinator.com/item?id=36195425

People got hung up on: - "COBOL defaults to..." rather than "banking practices are..." - epoch start dates - many pointing out COBOL didn't use epochs or counts, just much-damned YYDDD or YYMMDD actual strings.

Also, Elon loves to stir with partial misinfo hence his tweet https://x.com/elonmusk/status/1891350795452654076 with the breakdowns by age bracket. "Death set to FALSE" means "Death date not known" but that's not clickbaity enough.

That long tail looks awfully like data entered from historical records lacking death dates - there have been a few discussions of the cost of finding death dates and the decision to avoid spending $millions on it, as this is not data used to make payments.

You would expect, in a system that's pulling data from many sources, to see historical jumps in data cleanup like this. Imagine a few large states finally get around to digital records of deaths, so their data is easily aggregated - you get a sudden flushing of people who would previously have been left on the list. However, this will only apply from a certain age onwards as those sources in turn don't have the time/budget/interest to digitise really old records.