You're already tall. If you're interested in maximizing your growth, then take a look at the following scientific information.
There are several nutritional tips and techniques to maximize height up until our bones quit growing around age 20. Here are the most important tips, followed by supporting clinical evidence.
1) Take a daily multivitamin with micronutrients. See below for recommended micronutrients to improve height.
2) Take 1000mg (1g) of calcium carbonate supplement daily.
3) Take 3g of GABA (an inexpensive amino acid supplement) at least once daily to quadruple baseline growth hormone levels.
4) Engage in regular low-risk vibrational physical activity, such as plyometric training, volleyball, basketball, short-to-medium range jogging.
5) Practice meditation for 20-30 minutes regularly around dusk in order to reduce stress and improve hormonal profile for growth (cortisol can inhibit growth).
PubMed primary clinical journal articles:
http://www.ncbi.nlm.nih.gov/pubmed/18091016 - 3g GABA quadruples growth hormone levels.
http://www.ncbi.nlm.nih.gov/pubmed/15755856 - We conclude that calcium carbonate supplementation of adolescent boys increased skeletal growth, resulting in greater stature and bone mineral acquisition.
http://www.ncbi.nlm.nih.gov/pubmed/16426962 - The micronutrient-fortified beverage was beneficial in promoting growth and decreasing duration of common illnesses among middle-class residential schoolchildren who had adequate energy and protein intakes.
Diet and technique articles to increase height of children:
http://www.indiacurry.com/faqhealth/heightdietexercise.htm
http://www.articlesbase.com/nutrition-articles/diet-to-increase-height-your-best-height-increasing-food-to-eat-1010212.html
http://hubpages.com/hub/List-of-natural-foods-that-increase-height-naturally-Grow-2-to-6-inches-taller-naturally