Actor Brad Pitt is `surprised` by how much marriage has changed his relationship with wife Angelina Jolie. He now feels "real depth of commitment".

The couple, who raises six children -- Maddox, Pax, Zahara, Shiloh and twins Knox and Vivienne - tied the knot in August after being together for nine years.

Even though the `Fury` star didn't expect things to feel any different, he says the ceremony has changed how he feels about his family, reports femalefirst.co.uk.

`We have six kids so we felt beyond marriage already, but the kids were asking and we thought it would be a lovely thing to do, for them and for us as a family and it was all of that,` the actor told Hello magazine.

"But I was surprised afterwards at the effect getting married has had on us - it was more than just a ceremony, it meant a real depth of commitment. I feel like a married man - I really do," he added.

Although Pitt is 12 years older than his wife, the actor insists that they don't notice the age difference.

Pitt said: "We're probably around the same age maturity-wise - that's the way it works with men and women right? ... But I don't feel any different from having turned 50. I've never been one of those guys who counts time or thinks about the five-year plan or the 10-year plan.

"I'm pretty clear about how I want to live my life and what I want for my family and my wife and kids and that determines how I feel."