Answer. There are a lot of other developments that take place at different tempos in children. These occur during adolescence. The developmental age is always different from the chronological age. The stature and the skeletal growth of the child determine this growth. The maturity of the body can be measured by studying the X-rays of particular parts of the body and analyzing them with the size chart. Depending upon the environment, children of some societies grow at a higher rate. The development in the adult years is rapid. Some of the primary changes include the growth of facial hair and strength in boys. Broadening of the pelvic region is seen in girls.