How to improve my height at now age is 20 ? now i am 5ft only

Nature controls that: There is rarely any growth after age 18 or 19 years. Most people reach their maximum height before that age. Without nutritional problems or chronic childhood illnesses, a person's height is largely based on genetics and parental heights. Aside from eating right, exercising, sleeping well, and being happy, there's not much a person nor his doctor can do to increase the final height.