Changes in the shape of a human head and the development of facial wrinkles were examined as potential sources of information about age level. In Experiment I, subjects estimated the ages of faces that had been produced by systematically manipulating characteristic head shapes and levels of wrinkles associated with ages 15, 30, 50, and 70 years. The results indicated that observers used both sources of craniofacial change in making age estimates; but the effect of either source of change on perceived age depended upon the level of the other source of change. In Experiment 2, subjects' ratings of the apparent conflict between levels of head shape and wrinkles further substantiated the conclusion that observers are sensitive to the coordination of products of the two sources of change. These findings suggest that the information specifying perceived age level is a complex relationship among different typesof craniofacial change.As people become older, their faces are subject to many changes: Throughout roughly the first 20 years of life, the head undergoes aglobai remodeling that effects a marked increase in the size of the facial mask (face) relative to the cranium (Enlow, 1968;Hogarth, 1965;Moore & Lavelle, 1974), in adulthood, wrinkles, creases, bags, and wattles develop in response to biomechanical stresses (such as gravity, characteristic facial expressions, and facial postures) and chemical changes in the structure of collagen fibers (Kohn, 1971; Viidik, 1973); progressive changes in skin texture and hair color, as weil as loss of teeth (edentation) and hair (balding) also occur frequently with advancing years, Each of these characteristics can be said to provide perceptual information about a person's age precisely because each is produced by a continuous change resulting from physical and biomechanical stresses occurring throughout the lifespan. Moreover, these changes do not take place independently of each other (Enlow,