Tom Brady was 31 years old when he tore his ACL.
How the age is calculated
Tom Brady was born on August 3, 1977.
He tore his left ACL in the New England Patriots’ 2008 regular-season opener on September 7, 2008, against the Kansas City Chiefs.
That date is a little over one month after his 31st birthday, so he was 31 at the time of the injury.
