A fifth of girls as young as 12 won't leave home without full make-up - and over half of under-14s wear cosmetics EVERY day. Girls as young as 12 are afraid to leave home without wearing a full face of make-up, new research has revealed. A new study has found that over half of 12 to 14-year-olds wear make-up most days and 17 per cent refuse to leave the house without make-up on.