I am 18, so maybe still growing, I am tall, 6ft 4 and weigh about 200 lbs. Penis is 14cm erect. Let me know what you think. Thanks.
From MensFAQ: 14 cm is approximately 5.5 inches which falls into average size bracket. This said – you’re young and possibly could grow another 1 – 1.5cm by age of 21. This would make your penis around 6 inches long when erect.
Best advice at this stage would be to have healthy diet and healthy lifestyle. Ensure you get all the vitamins and foods to ensure your maximal development.