The decline of collagen, elastin, and melanin in a person's body are primarily related to sexual changes that occur in late adulthood. Correct answer: C
As people get older aging changes in the skin occur. Changes in the connective tissue reduce the skin's strength and elasticity.After the age of 20, a person produces about 1 percent less collagen in the skin each year. As a result, the skin becomes thinner and more fragile with age