Hey there!
Here is your answer:
The proper answer to this question is "The reason humans go through puberty because its a sign that you are becoming a adult. The age that humans mainly go through puberty would be 13-15. Puberty is the change of the body in growth, able to grow hair in certain areas, also able to reproduce and have children. Puberty happens to both male and female and its a sign of growth. Mainly talking about a child to a young man or lady, then to a adult. Its basically a step a life that every human goes through in order to change into a young lady or man then to go through to a adult".
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit