Which type of hair is typically found in mature adults?

Terminal hair is the type that is typically found in mature adults. This hair is characterized by its thickness, length, and pigmentation and is commonly found on the scalp, face (in men), underarms, and pubic areas. It develops during puberty as hormone levels change, leading to the transformation of fine vellus hair into coarser terminal hair.

Distinct from terminal hair, vellus hair is soft, fine, and often unpigmented, which can be present on various parts of the body but does not have the characteristics of more mature hair. Lanugo hair, on the other hand, is a fine, soft hair that covers the body of a fetus and typically disappears before birth. Peach fuzz can refer colloquially to light vellus hair that may be visible on the face but does not convey the maturity associated with terminal hair. Thus, terminal hair defines the adult stage of hair growth due to hormonal influences and is the most appropriate answer in this context.