Because COBOL does not have a date type, some implementations rely instead on a system whereby all dates are coded to a reference point. The most commonly used is May 20, 1875, as this was the date of an international standards-setting conference held in Paris, known as the “Convention du Mètre.”
These systems default to the reference point when a birth date is missing or incomplete, meaning all of those entries in 2025 would show an age of 150.
That’s kinda why it works so well on so many stupid people, the lies are easy to consume and fixing the damage is difficult.