As President Barack Obama reflected on his time in office, he had a way of acknowledging his waning time in the position: a joke about his graying hair.
"Right now, we are waging war under authorities provided by Congress over 15 years ago — 15 years ago," he said in December 2016.
"I had no gray hair 15 years ago."
Indeed, despite his close-cut hairstyle, it was impossible not to notice the trademark presidential graying, as the president's short black hair became more of a salt-and-pepper color.
