He knew he’d be under a microscope, but this is ridiculous. The New York Times reports today that U.S. President Barack Obama’s hair is conspicuously whitening, citing among other authorities an author who compiled a book of photographs from Obama’s campaign. The weight of office is a well-known whitener: Brian Mulroney and Bill Clinton count among leaders whose age seemed to accelerate after they took power. Presidents age two years for every year that they’re in office, says Dr. Michael F. Roizen, the co-founder of a website that tells you how much older your body really is because of your lifestyle habits. And Obama faces extraordinary stress even for a commander-in-chief. Still, six weeks seems a little early to start marking the process with hair analysis.