It’s old, but it’s not horribly atypically old. 10 US presidents (John Adams, Jackson, William Harrison, Buchanan, Truman, Eisenhower, Ford, Reagan, Trump, Biden) were 60 or older when they took office, although there’s a whole 88 year gap between Buchanan and Truman (meaning 60% of all presidents aged 60 or older when taking office were elected within the last 79 years/33.6% of the US presidency’s existence, and a whole 40% of presidents starting from Truman were 60 or older when they took office).
It’s old, but it’s not horribly atypically old. 10 US presidents (John Adams, Jackson, William Harrison, Buchanan, Truman, Eisenhower, Ford, Reagan, Trump, Biden) were 60 or older when they took office, although there’s a whole 88 year gap between Buchanan and Truman (meaning 60% of all presidents aged 60 or older when taking office were elected within the last 79 years/33.6% of the US presidency’s existence, and a whole 40% of presidents starting from Truman were 60 or older when they took office).