Are we all so differents?

This images told us that we are all diferents, that we have little small diferences that split us.  The race, te colour of our skin, ous social condition, even our ages!
But also, we can see that for the childrens, there are no differences that split us apart. For them, the world is big and everyone is perfect. Why can't we do that? Is that so dificult?
I said that we mus be more like the childrens, and enjoy the life.
What do you think?