Happy Birthday, Mr. President! President Obama celebrates his 50th birthday today at the White House. Spending the night before his birthday at a campaign fundraiser in his old hometown of Chicago, the president kept his milestone birthday lighthearted. “By the time I wake up, I’ll have an email from AARP asking me to call President Obama and tell him to protect Medicare,” he joked. The president’s senior staff will hold a toast for him in the White House Blue Room today, followed by a party this evening at the White House Rose Garden, hosted by the President and First Lady. Obama, who took office at age 47, is the fifth youngest president in American history.