How tall is everyone? Well, with the average height of each person in the world is 183.3 cm, and there are 7.125 billion people in the world, the height of everyone would be approximately 1.306 * 10^12 cm tall. That is 42848179133.85 feet.
And yes, there is a lot of room for error in these calculation due to much of the population not being full grown as well as there not being 7.125 billion in the world precisely.
21 and just under 5'4. I think I'm like 5'3 and three quarters. Hopefully I have it in me to finish growing that quarter of an inch (wishful thinking). I do like my height though.