Michelle Obama

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FILE - In this Jan. 15, 2014 file photo, first lady Michelle Obama speaks in the State Dining Room of the White House in Washington. Michelle Obama turned 50 on Friday and promptly showed off her AARP card. It was probably a good way to spend the birthday, laying low and resting up for a big birthday dance party the president has been planning for Saturday night at the White House. The White House isn't releasing any party details but word did leak out that guests have been told to come prepared to dance. (AP Photo/ Evan Vucci, File)

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First lady Michelle Obama speaks in the Eisenhower Executive Office Building on the White House complex in Washington, Thursday, Jan. 16, 2014 . Michelle Obama is celebrating her 50th birthday Friday. The first lady was spending the day out of sight, with no scheduled public appearances after back-to-back events at the White House this week. A big birthday bash is on tap for Saturday night at the White House. President Barack Obama has been involved in planning it. (AP Photo/Charles Dharapak)

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First lady Michelle Obama tweeted a photo of herself Friday holding her new AARP card on her 50th birthday.

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First lady Michelle Obama gestures while speaking in the State Dining Room of the White House in Washington, Wednesday, Jan. 15, 2014, where she hosted a screening of "The Inevitable Defeat of Mister and Pete," a coming of age story about two inner-city youth who are left to fend for themselves in the Bronx. (AP Photo/ Evan Vucci)

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FILE - In this May 13, 2009, file photo, first lady Michelle Obama hugs a third grade student at Ferebee-Hope Community School in southeast Washington. The nation’s first lady turns 50 on Friday Jan. 17, 2014 and, by her own account, feels more relaxed now that President Barack Obama’s days as a candidate for elected office are over. (AP Photo/Manuel Balce Ceneta, File)