At 9 or 10 years old, the skin barrier is not fully formed and is easily damaged by products with active ingredients like vitamins A and C.
The skin barrier - the outermost layer - is meant to protect from irritants such as pollution, dust mites, and fragrances in skin care products, according to the American Academy of Dermatology. At 9 or 10 years old, the skin barrier is not fully formed and is easily damaged by products with active ingredients like vitamins A and C.