United Kingdom, July 17 -- Matt Damon admits it "doesn't take much" to make him and Ben Affleck "emotional".

The 55-year-old actor has been best friends with Ben, 53, since they were growing up in Boston and they've navigated everything together, from Hollywood to growing their respective families.

He told PEOPLE magazine: "We're at very similar stages with the kids, and it's definitely a new phase of life.

"It doesn't take much to get us emotional at this point."

Matt has daughters Alexa, 27, Isabella, 20, Gia, 17, and Stella, 15, with his wife Luciana while Ben has kids Violet, 20, Seraphina, 17, and 13-year-old Samuel with ex-wife Jennifer Garner.

While seeing his children grow up is "emotional", The Odyssey actor has been mindful...