Matt Damon is astonished at how quickly his daughters are growing up

Matt Damon is astonished at how quickly his daughters are growing up.

The 53-year-old actor is father to Isabella, 18, Gia, 15, and Stella, 13, and also has stepdaughter Alexia, 25, from his wife Luciana Bozan's previous marriage and explained how he and his 'The Instigators' co-star Casey Affleck - who has two teenage sons himself - are at a loss at how their offspring have grown so rapidly.

Speaking to PEOPLE magazine, Matt said: "I don't think we swap a lot of fatherly advice. I mean, we do talk about it, but it's more in the sense of just marvelling at how quickly it's passing.

"It's like suddenly your kid's going to college, and it's at a blistering pace."

Matt recently suggested that he had no problems with being an overprotective dad as his main aim is to build "self-esteem" within his brood.

He told SiriusXM's Andy Cohen: "Oh, man. I don’t know. I wouldn’t deign to give anybody advice other than I just try to listen and be helpful. I mean, ultimately, it’s about building self-esteem.

"I’m fine. I’m cool with [being an overprotective dad]. You know what I mean. That’s like an old trope that I think people, you know, like to play up. You know, dads like to joke about it amongst each other I think, sometimes, but no.

"You know, at least, our [25-year-old] has, you know, she’s got this incredible boyfriend who Lucy and I just love. We adore the guy and to see that she’s making those kinds of choices, really, it’s as good as it gets."