What is skeletal closure? Skeletal closure is when the bones are fully developed and will no longer grow. Usually, the bones close between the ages of 18 to 21 for men and 16 to 19 for women. When the bones close, height growth stops. However, some people whose bones close later may still have the opportunity to gain height through methods. What is secondary stimulation of bone closure? Secondary stimulation of bone closure is a method of stimulating bone development again through exercise and stretching. It is based on the fact that the human skeleton is mutable, not completely unchanging. us