The general shape or figure of a person is defined mainly by the molding of skeletal structures, as well as the distribution of muscles and fat. Growth is usually completed between the ages of 13 and 18, at which time the epiphyseal plates of long bones close, allowing no further growth see Human skeleton. Comparison between a male left and a female pelvis right. Females generally have wider hips relative to males in the same population. Images not to scale.