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Sunday was Joe Biden's 80th birthday. Our first octogenarian president is two years older than Ronald Reagan was when his presidency ended in 1989.
Biden is still fit and energetic, but he's also showing his age. His hair is thinner, his gait stiffer, his speech a little more garbled than when he arrived in the White House almost two years ago.
One thing hasn't changed: He's famously stubborn.
And now that he's 80, it's probably fair to describe him as a stubborn old man.
Ask anyone who's worked for Biden, and you'll hear a version of the same description: He listens to dissenting voices, but once he's made up his mind, he's almost unshakable.
"One thing I learned quickly," a former aide told me, "you don't tell Joe Biden what to say."