Similarities in different coming of age ceremonies

Although all these tribes are located in different areas around the world, I was surprised that most of their coming of age rituals were proceeded in a similar way. For example, a lot of tribes had hunting animals, and being isolated from the group/tribe members,etc. were common in a certain number of tibes. As well as this, I could see that some rituals were really painful and "harsh" and some were disappearing and becoming illegal due to the modernized law and the developing civilizations. Something that I have noticed, which a lot of tribes' ceremonies had in common, was that the girls' rituals were usually less painful and harsh than the boys'.