Everybody grows older, but when you’re president of the United States, the physical aging process happens a lot more quickly.

The previous commander-in-chief, Barack Obama, started going gray just 44 days into his first term as president. While some of that gray was coming no matter what, there’s no question that having the toughest job in the world contributed.

Check out how Obama, John F. Kennedy, George W. Bush, Donald Trump and other presidents aged in office by using the sliding images below:

Abraham Lincoln