I gotta say that your facts are truth, but don't u think it's not all about genetics.. Cause in our days right now there are a lot of improvements and developements everywhere for instants e.g The food we eat,Exercise physilities,Technology etc all thoughts of things are invented and developed now.. So i guess this means that we have more chances of growing and being healthy then our parents and grandparents

height is genetic but u can defianlty alter your max height while your still growing!!!