[gabrielgrant]

Actually, "Year of Birth" appears to be one of the voter file fields too. Not quite the same as an exact birth date (esp for identity theft purposes), but useful for demographic targeting.

[whoopdedo]

Identity fraud is more likely with this information because SSNs are fairly predictable.

https://www.pnas.org/content/106/27/10975

[ryanlol]

Nobody spends their time predicting SSNs when accurate profiles cost 10 cents or less.