Biden, First Octogenarian President, Turns 80

Subheadline: Expert says President's background, lifestyle promote healthy aging

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President Joe Biden will turn 80 on Sunday, making him the first octogenarian to serve as president of the United States. Biden has addressed his age head-on in interviews and has presented himself as a bridge to the next generation of leaders. Despite his age, experts say Biden's background and lifestyle are conducive to healthy aging.