Can you tell me about the final height for a 5'11" 176 lbs 15 year old boy?

Growth curve chart: During the teen age years, there is a natural acceleration of growth in height and weight. The growth curves for his age are available online and at his pediatrician's office. If he is following a curve for his height, then he would be expected to achieve his adult height at around 18-20 years of age. By checking his growth chart, you can estimate this information.