ID Scanner versus Age Calculator

Was browsing Web and just found an age calculator that claims to eliminate human error.  Basically you key in the date of birth from the front of the drivers license and the calculator displays the age.  While the unit is certainly inexpensive, I must challenge its claim of eliminating human error.  If a clerk either mis-keys the date of birth on the keypad (i.e. typo) or if mis-reads the date of birth (i.e. sees a "3" when its really an "8"), then the age calculator will give you the wrong age.  A better claim would be eliminate math errors but a real ID Scanner eliminates all these issues.