Then why does this bill require "Proof of the person's social security account number" for a _driver's_license_? I'm sure it doesn't have anything to do with your federally-mandated retirement plan...
Probably because we all know that the SSN is really a national id and our governments want to know everything about us just in case they can use it against us at some time.
If I recall correctly, if you have a medical condition that causes you to black out unexpectedly, you are required to take certain medication or your doctor is legally required to report you to the state DOT so they can suspend your licence. I'm sure they use SSN for that. Nice, huh ?
Otherwise, no reason I'm sure. In reality, a birth certificate should be all that's necessary to prove birth date.