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= Gerontocracy in the United States =

Gerontocracy in the United States is a term used to describe the increasing graying of the country's political class.

Presidential
Andrew Jackson, America's seventh president, became the oldest president upon his inauguration in 1829 at 61 years and 354 days, succeeding the second president, John Adams by 229 days and as such becoming the first non-founding father to inherit the role. William Henry Harrison, who in 1841 became the ninth American president, became the oldest person to enter the role at age 68. Harrison's record (which never increased due to his death early in his first year) remained unsuperceded for 140 years until topped off by Ronald Reagan, who at the time of his inauguration in 1981, became the oldest at age 69. Having left office in 1989 at age 77, Reagan's record stood until Joe Biden's inauguration in 2021, lasting for 40 years. Biden, the first octogenarian president, is the oldest person to have served in the role.