Michelle Obama shows off AARP membership card on her 50th birthday

Michelle Obama is celebrating the big 5-0, proudly flaunting her membership in the AARP.

"Excited to join Barack in the 50 club today… check out my @AARP card! -mo," she tweeted Friday about her milestone birthday, posting a picture of herself displaying her membership card for the senior's advocacy group.

The President is 52. The White House didn't announced any public appearances for the First Lady on her birthday.

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