The factors that affect a person's height are numerous. Although genetics plays a large role, it does not determine a person's height 100%. Relevant expert research has proven that among the many factors affecting height, genetics accounts for 33%, postnatal exercise accounts for 20%, nutrition accounts for 31%, and environment accounts for 16%. A person's height is determined by the growth and development of their bones. At the ends of the long bones, there is epiphyseal cartilage that is specifically responsible for bone growth.