TOEFL Practice - is childhood the happiest stage of life?

This is part of a practice test for the TOEFL. I will would appreciate your comments on what is good and what can be improved. Thanks in advance!!!

Childhood is undoubtedly one of the most important stages of one a person's life. This periofd shapes who we are in the future and builds our character for life. It is sometimes idealized in Western movies, that most of the time show kids living in a happy environment, playing joyfully with other kids and having good times with their families. But this is not always the case for every child in the world, and what movies do not show is that there are many suffering and whose (Is this the correct form of whose/who's?) reality is far from being the one depicted in movies

Many children in the world live in poor conditions. Take for example regions such as Latin America or Africa, in some of their countries there are no conditions to meet basic children'ss' needs, such as food and health. They are exposed to diseases which make them suffer and do not allow them to develop in proper conditions.

There are some others that are abandoned and lack protection from their parents. Therefore, they are exposed and vulnerable to threats such as child abuse and violence. This results in kids raised with hatred, who eventually reproduced these conditions with other human beings.

Summing up, childhood is not always the happiest time in a person's life. The person's experience is highly relative and there is not standard for how childhood is lived. Some people have bad memories about their experiences when they were kids and would rather delete those memories for being tragic in their lifes.

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Very good job and well-written!