Lifelong friends Ben Affleck and Matt Damon have shared the Hollywood spotlight for years. Together they wrote their 1997 hit, Good Will Hunting, which earned them two Oscar wins and marked a major career breakthrough for both stars. Since then, they've continued to collaborate through Project Greenlight, and the actors regularly step out to support each other's work. Ben and Matt most recently hit the red carpet together in August, and during press rounds for The Martian, Matt shared what it was like to be Ben's friend during the J Lo days. Since Matt turns 45 this week, we're celebrating with a look back at some of his best moments with Ben, so keep reading to see the stars' many memorable appearances together over the years.