It’s common knowledge that 1600 Pennsylvania Avenue is one of the quickest routes to a lined face and grayed temples, and yet the transformation is nevertheless fascinating to watch.
The Washington Post pieced together 99 photos of President Barack Obama that chronicle how his time in the White House has aged him — the lines, the deeper creases, the salt-and-pepper hair (and how some of that color will sometimes mysteriously become more uniform).
There’s even a cool interactive tool that allows you to slide the years on or off (shown above).
The “why” part is easy: unending, unfathomable stress.
“You see it over a term,” Ronan Factora, a geriatric medicine specialist at the Cleveland Clinic told the Post. “It’s a good study of chronic stress on a person’s overall health.”
See the full progression at the Washington Post, including features on former Presidents George W. Bush, Bill Clinton and George H.W. Bush.