show ad Teenagers' stress and anxiety levels are at an all-time high with middle-class children the worst affected * Teenagers are suffering record levels of anxiety, Government report finds * Middle-class children have higher levels of stress, the research discovered * Reliance on tablets and smartphones could be contributing to their -- challenging time’ and its most striking finding was that children from ‘advantaged’ households had significantly higher levels of psychological distress. RELATED ARTICLES -- * Heroic grandmother, 67, becomes the world's oldest surrogate mother after carrying her daughter's child * From stressful family gatherings to overindulging on festive turkey: Five ways Christmas affects your brain * Revealed: The Pizza Express Christmas special that contains 1,524