Daughters cause of Obama's grey hair not job: US First Lady

US First Lady Michelle Obama has said that the reason for the recent surge in President Barack Obama's grey hair is not the stress of the high-profile job but his teenaged daughters.

First Lady Michelle Obama joked in an interview yesterday that watching his two daughters, 14-year-old Malia and 11-year-old Sasha, grow up and approach their teenage years is a scary thing for the President.

"There's nothing like the look on his face when Malia dresses up for a party and she's heading out," Michelle was quoted by the New York Daily News as saying.

"She walks past him," Michelle said, "and you can see his face sort of just drop a little bit. It's like, 'who was that?'"

And that hair that's gotten very noticeably greyer since his first inauguration? "People think the grey is from his job," the first lady joked.

"It's from his children," she said. Obama, 51, has been noticeably seen sporting grey hair in his second coming as President.