AceShowbiz - Michael Buble insists he's a 17 year old on the inside. The 47-year-old singer - who shares Noah, nine, Elias, seven, Vida, four, and five-month-old Cielo with wife Luisana Lopilato - he admitted he's really quite immature while people assumed he's an old soul.

"People think I'm 70 on the inside but I'm more like a 17 year old. That's my maturity level," he told Red magazine.

The Canadian crooner loves the fact his lengthy career has meant people of different age groups think of him in different ways, but the interactions he has in public have left his brood confused. He said, "It's interesting when I meet people walking down the street."

"One person will say, 'You're the Sinatra of our generation!' Some teenagers will start singing, 'Haven't Met You Yet', and then someone else will yell, 'Oh my God, it's Mr. Christmas!' Can you imagine how weird it is for my kids - they're just standing there thinking, 'Who the f*** is my dad?' "

The "Home" hitmaker is a "maverick" and teased he's heading in a new musical direction in the future - even though he is aware he could "alienate" his old fan base. He said, "I'm a maverick. I don't know where I belong and that works for me."

"But the vision has always been to show growth, however alienating that might be to people who liked me in the first place. That's coming. I can't tell you the exact projects, but you'll know soon enough," he added before quipping, "Anyway, I'm 17 right? I've got tons of time."