Why Does Ann Coulter have two legal birth dates?

From dKosopedia

Category: MemeTank

In September 2002, Washington Post columnist Lloyd Grove wrote a column titled, "Mystery of the Ages", raising questions about Coulter's actual date of birth.

Grove pointed out that Coulter had given her date of birth as December 8, 1961 when she first registered to vote in 1980 in New Canaan, Connecticut, where the legal voting age is 18. Coulter's Connecticut driver's license also listed her birth date as December 1961,

But a driver's license issued to Coulter years later in Washington, D.C., gave her date of birth as December 1963.[1]