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Here's a dermatology report on aging and hormones.

The skin is constantly exposed to harmful environmental forces such as ultraviolet (UV) radiation, air pollutants, heat and cold. Besides these external factors, the skin also has to cope with internal forces such as the aging process and free radicals. Free radicals are molecules that injure the skin´s cells, causing inflammation, increasing sun damage and contributing to the development of skin cancer. Antioxidants can reduce the harmful effects of free radicals and protect the skin from additional stress and damage. Common examples of antioxidants include vitamins A, B, C and E, co-enzyme Q10 (ubiquinone), idebenone, polyphenols and flavonoids such as green tea and soy extracts, and kinetin, a synthetic hormone derived from plants.