Happy Birthday, Jake Gyllenhaal!.br Jacob Benjamin Gyllenhaal br turns 39 years old today.br Here are five fun facts br about the actor.br 1. Gyllenhaal made his big-screen debut br when he was 11 in ‘City Slickers.’.br 2. He starred alongside his sister, br Maggie Gyllenhaal, in ‘Donnie Darko.’.br 3. He is known br to keep his br life private.br 4. He named his dogs Atticus and Boo br after two characters from his favorite book, br ‘To Kill A Mockingbird.’.br 5. Gyllenhaal learned br how to drive from actor br Paul Newman.