DOB

Set to 5 different clues across 5 published puzzles, most often “5/29/1917, for J.F.K.” — The New York Times, Thursday, 2 June 2011.

3 letters

Every clue on record, most used first

5/29/1917, for J.F.K.once
The New York Times — Thursday, 2 June 2011
July 4, 1872, for Calvin Coolidge: Abbr.once
The New York Times — Thursday, 24 March 2011
When you entered this world: Abbr.once
The New York Times — Tuesday, 27 April 2010
Driver's license stat.once
The New York Times — Saturday, 14 August 1999
Driver's lic. statonce
The New York Times — Sunday, 6 September 1998