Miley Knows Where the Angus Is 9/26/2008 10:11 AM PDT BY TMZ STAFF 15-year-old Miley and her 20-year-old underwear model beau Justin Gaston went out for an unchaperoned date to a bar last night ... the 8 oz. Burger Bar on Melrose.She's sticking by her story of never being late to set. We're sticking by ours. See Also Miley -- What, Me Difficult? Disney to Miley: Face the Music or Else!