Does any country have an age limit for its head of state/head of government?

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I know by a fact that the United States doesn't (the President of the United States is both the head of state and the head of government).

Wrong to run for president you must be 35

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That's not what I was talking about.

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Is 35 the maximum age for being President of the United States? How is it possible that Biden, elected at 77 years of age, became president? That would be considered unconstitutional.

Well you need to be specific. Age limit applies to not just maximum age but minimum as well. Just like there's a limit on when you can start drinking being 21 or when someone can have sex. The same is true for the election. One must be a minimum of 35 to be eligible