It’s harder to grow taller quickly at age 20, it’s already past its peak. Generally men stop growing taller at age 25 and women stop growing taller at age 23. Generally after the age of 15-20 growth rate is slower. Can be elevated through scientific exercise and scientific diet may: a. To get enough sleep, do not stay up late. Second, the diet, drinks as far as possible to choose milk, mainly to supplement calcium. Insomnia at night, you can drink milk to improve sleep. Third, the sun, bones and plants are very similar, the sun’s nourishment has a certain impact on height. Fourth, exercise, you can choose some jumping exercise to increase height.