In the United States, films that are labelled ~ are not considered suitable for children under the age of thirteen, but parents can decide whether or not to allow their children to see the films. PG is an abbreviation for ‘parental guidance’.
PG-13
Meaning of PG-13 in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012