I've always wondered why older people have to remain in casts and off their feet for so long after fracturing a bone. I had no idea that metaphysis is not bone, but a cartilage when we are young. It's just like our nose which also tends to heal faster because it's a cartilage. I think this is really cool!
I'm 25 now and I know I'm not going to grow any more after this. I grew a lot up until I was 16, and then it slowed down a bit until I was 22 and I grew some more. I haven't had any change in my height in the last two years though so I guess my bone metaphysis is entirely complete and solid.