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

Two photos side-by-side — one from US 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.

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The president 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."

Explore the best photos of the final SOTU:

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

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:

This video shows how Obama has gradually aged over the years since he took office:
Many presidents before Obama have seen similar effects of office.

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