See how the lifelong BFFs have stayed close since their big Academy Awards win in 1999
Matt Damon's 31st Birthday
Affleck feted his friend at Library inside the Hudson Hotel in New York City on Oct. 6, 2011. "For a while, we thought maybe we should chill and just do other stuff, and not be Matt and Ben, Matt and Ben," Affleck has said. "But we have our company together and we're developing together."
Credit: Sylvain Gaboury/FilmMagic