Question

wrinkles in old age appear due to which substance and why

Answer 1

Intrinsic aging is a natural process of aging which comes because the person after the age of 20 starts producing less collagen in the skin; collagen is responsible for the firmness of the skin. But when it is produced in fewer quantities the skin becomes thinner and fragile. The sweat and the oil glands also function less. Elastin, which provides skin its elasticity and rebound also functions less. Glycosaminoglycans or GAGs keep our skin well hydrated also are found to diminish.