Raven-Symoné has warned showbiz bosses will try to “milk” the “light” out of young performers. The 38-year-old – born Raven-Symoné Christina Pearman – shot to fame playing Olivia Kendall on ‘The Cosby Show’ and went on to release a string of albums, with her first record coming out when she was aged seven. Raven told Demi Lovato, 32, on the singer’s documentary ‘Child Star’ during a discussion about their gruelling work schedules: “People are going to milk all of that light out of you because, ‘You’re young and you still have energy’. “But you do not. You’re still human.” Raven added about her…