Because all vertebrate species, including humans, obtain information from looking into each other's eyes, the eyes are often the first object of attention of people upon meeting each other. In humans, the physical characteristics of youth are strongly associated with the conceptual standards of beauty. With age, the position of the lids changes, the exposed surface of the eye decreases, the lid's skin loses surface uniformity and develops wrinkles, and its hue darkens. Eyelashes decrease in number, length, thickness, and darkness, and their form and position change. In youth, eye makeup enhances natural beauty; later, it can serve to simulate the attractive characteristics of youth.
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