Ashton Kutcher was a "late bloomer".

The 'Killers' actor - who married Demi Moore in 2005 after two years of dating - insists he never felt strange becoming a stepfather to the actress' daughters Rumer, 21, Scout, 18, and 16-year-old Tallulah, because he was used to people in his hometown having children at a young age.

The 32-year-old star said: "I'm from Iowa. People from Iowa get married when they're like, 20, so I was kind of a late bloomer."

Ashton - who admits he and Demi haven't ruled out having a baby together - insists his family will always be his top priority.

He added in an interview with LOOK magazine: "Family is the most important thing. It's the only thing you really get to leave behind in the end.

"I've been with my wife for seven years and we've had kids since the beginning - we Take That really seriously.

"We've made a lot of sacrifices in our relationship to support them, so when I go on location sometimes Demi stays behind. It's exciting to have a stable relationship and a stable career."