Photos show the striking difference between Obama at his first and last State of the Union addresses

Two photos side-by-side - one from President Barack Obama's first State of the Union address in 2009 and another from his last on Tuesday - show how much the president has aged over the course of his two-term presidency.

Obama looks relatively young in the first photo, while the second shows graying hair and wrinkles.

The president himself has acknowledged his aging, saying last year: "When I came into office, I had no gray hair, and now I have a lot. I don't dye my hair, and a lot of my fellow leaders do. I won't say who, but their barbers know."

Time magazine posted the two images after Obama's speech on Tuesday, and the images have been circulating on social media since:

Obama's first address in 2009 vs his most recent.

The stresses of office certainly seem to have affected Obama, but his aging still isn't quite as drastic as Bloomberg Businessweek predicted it would be:

Businessweek's estimation of how Obama would age versus reality. pic.twitter.com/3SPfzHTGOb

- Robyn Kanner (@robynkanner) January 13, 2016

Many presidents before Obama have seen similar effects of office.