To be honest, I don't believe that there is a healthy way to significantly increase height. OK, we have showed that we can increase our penis size, but there are so many bones and complex structures throughout our entire body, that an intended growth seems unrealistic.
The good news is, that there are a lot of people that have grown tremendously after their 18th and even 20th year of age. An old classmate of mine was about 6'2" in the 12th grade and last week I saw him he was like 6'6" at least. Same story with my brother who was barely 6'5" before entering the army and after two years he stands at close to 6'10" in shoes. It probably has got something to do with genetics (well, without a doubt), I think they kinda provide you a maximum height and if you eat and live healthy you'll reach that maximum, otherwise you'll stunt at a few inches shorter.
Just think positive, the shorter you are, the bigger looks the dick on you. Plus it gets extremely impractical if you are tall, especially when it comes to buying clothes...