U.S. Vice President Joe Biden, who married for the first time at the age of 23, keeps telling girls they should not date until they are 30.

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Biden repeated the advice many times Wednesday as he swore in new senators, The Washington Post reported.

He was bipartisan, with the same words for young relatives of Democrats Barbara Mikulski of Maryland, Michael Bennet of Colorado and Chuck Schumer of New York as well as Republican John Thune of South Dakota: "Just remember, no dates till you're 30."

The joke is an old one for Biden. Sydney Toy, 12, of Carbondale, Pa., told the Post she got an autographed picture when she met the vice president in October along with the advice to avoid dating until she is 30 -- advice she does not plan to follow.

Biden married his first wife, Neilia, when he was in law school. In 1975, three years after her death in a car crash, he met Jill Jacobs, who was then 23, on a blind date and married her in 1977.