Witch president has been younger than 65 at the time of his inauguration

I think president Obama has been younger than 65 at the time of his inauguration. 

There are some presidents that have been younger than 65 at the time of inauguration, but the youngest president of them all is John F. Kennedy, who was inaugurated at 43 years old.. Barack Obama was another president younger than 65 at the time of inauguration.

Idk 30 cookies, 1 brownie