Hello and welcome to HCM
There is increase in height in boys and girls during puberty
due to rapid bone growth.
By the end of adolescence the ends of the bone fuse and the incraese in height ceases.
So, by 17 the bone ends have closed/ fused. This is the cause of height being static not mastrubation.
is a harmless habit however, over indulgance may interfere with normal routine.
This should be avoided.
Thanks and take care
Dr Shailja P Wahal