5 year old vs. 18 year olds

It was funny seeing that book again, the one with all of the different cultures and their possesions. My Grandma has the same book that she used to show me all of the time. Back then to me it just looked like a lot of different people with a lot of different stuff in some very different places. Thing was though, I was right, thats all it really was. Yet, how is it that I wasnt suprised when I was around 5 years old, and the entire classroom was shocked at around 18 years old? I belive its because as people get older their minds get more complexed. As well as people grow so accustomed to the same routines within our own culture, that it closes our minds off from all of the different cultures around the world. Where as if you have a 5 year old who doesn't even know all the aspects within her own home, its more easy to convince them that the way of the world is different. Its like working with a blank canvass compared to working with a painted canvass. Which one is more easy to paint new ideas onto? As people grow older though, we are educated by people within our culture that teach us to follow a set of rules. Such as eating with a fork and knive compared to eating with chopsticks. Different people for different places have been taught in different ways. So the more they become educated, the stranger it is to them to see other people with a different lifestyle. Which is one of the reasons why I belive that a child's mind is one of the best kinds of minds. For their simplicity allows them to see the world and different cultures as just another new thing.