How Old Is Matt Damon — Matt Damon was born October 8, 1970, making him 55 years old as of mid-June 2026. He turns 56 on October 8, 2026 per People and Biography.com verified records.

Biography.com and People list Matt Damon's birth date as October 8, 1970, in Cambridge, Massachusetts. That Libra birthday anchors every age calculation fans search for online.

To answer how old is Matt Damon, subtract 1970 from the current year and adjust if today is before October 8. Mid-June 2026 means age 55 because his birthday has not yet arrived this year.

From Good Will Hunting at twenty-six to The Bourne Identity at thirty-one and The Martian at forty-four, Matt Damon's age tracks a career spanning Cambridge roots through Hollywood dominance in his fifties.

Matt Damon turns 56 on October 8, 2026 — the same date fans mark every year with birthday posts and streaming parties. He is 55 throughout June 2026 until that milestone arrives.