Barack Obama's longtime Chicago barber says his client has kept mum about his graying hair. "It's just a normal thing," Zariff, who's been cutting the President-elect's hair for 14 years from the Hyde Park Hair Barber Studio, says in the newest issue of Us Weekly. "It's not like he has a head full of gray hair," adds Zariff - who only goes by one name. "It's just a few gray hairs, so it's nothing...