The 40-year-old actor - who has four-year-old Isabella, two-year-old Gia and three-month old Stella with wife Luciana, and is stepfather to her 11-year-old daughter Alexia from a previous marriage - didn`t mind reaching the milestone age recently because he has fulfilled his personal goals.
He said: "It`s a good birthday - because a lot of the bigger questions are answered.
"I`m married with kids, all the things I was worried about at 30 I don`t worry about any more."
Though Matt is contentwith his personal life, he still has professional ambitions he wants to achieve - including working with his friend Ben Affleck again.
He told Empire magazine: "You don`t always get to work with the people that you want to. I mean, I haven`t worked with Ben in years and he`s my best friend."
Matt and Ben shot to fame after co-writing and starring in `Good Will Hunting` together in 1997.
The movie earned them the Oscar for Best Writing in 1998.