| http://www.w3.org/ns/prov#value | - Do presidents age faster in office? ??? (CNN) ??? President Barack Obama has had the weight of the free world on his shoulders for the 2?? years, and he might be starting to look like it. ??? At 50, which he turns Thursday, his hair is a little grayer, and his face and neck are a little more creased ??? +
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