The first stage: from birth to 6 years old. The second stage: 7- 12 years old, medically called developmental stage. The third stage: 13- 15 years old (female) and 14- 16 years old (male) are the peak periods of development. The fourth stage: 16- 17 years old (female) and 17- 18 years old (male) are in the low development stage. /kloc-After 0/8 years old, the epiphysis of long bones closed and most of them stopped growing. Face shape is also related to obesity and muscle thickness.