1. Growing from a Child into an Adult
Centuries ago, we aged a bit differently due to living smaller periods of time. This speed at which life started and ended was rapid. This is why women grow up faster and stop growing by their mid-teenage years. They were needed to bring new life to a family. A girl at age 12 can actually have children, however, the youngest girl to give birth on record was only 5 years old. Boys grow slower but this is due to their specific needs for growth.
Both experience hormone changes but women experience a lot more at a faster rate, so give that teen girl crying for no reason a break next time. Boys grow slower and stop growing by their early 20s physically. The reason for this was due to the need for young men to always adapt their development to the environment they are in. On top of this, today we grow up slightly slower than we did back then. We even show our age later, which is why some can look much younger than they truly are.