Yet paradoxically, being old is nearly a requirement for political office.
Biden was the oldest president in history, and with his re-election, Trump will become the oldest president in history should he live out his term.
The average age of the 119th Congress overall is 59 years old, with the House averaging 57 and the Senate averaging 64. For comparison, the average age of the US as a whole is just under 39.
This is probably one of the largest reasons the country is in the state it's in: most of those in power won't live long enough to see the consequences of the policies they enact, so they don't give a damn.