How accurate is the moved out wristbone x beam on increase?

my doctor did an x ray on my wrist and said my bone age is 16 and i enjoy 3-5 inches left to grow do you have an idea that its right? They did this to me when I was roughly 12 and they were accurate that I be still going to grow until I was up to age 18. I stopped growing towards that age and most of the growth spurt happen when I was 16 appreciation to exercise.
They also did it to my sister and they were also right near her that she'd stop growing at age 16 and their approximate height be accerted as well. I concluded up being taller than her too.