The passage of time affects everyone, and the weight of leading a nation is no small thing. Looking at images of President Obama from his first and last State of the Union addresses, the years are certainly visible, as they would be for anyone carrying such significant responsibilities.
Through it all, he appeared to maintain a positive outlook and sense of humor, which speaks to his character. Like any president reaching the end of their term, there is no doubt a sense of anticipation in looking ahead to life beyond the demands of the Oval Office.