Oldest Best Friend come at some Age?

Looking at your friends, and see who is actually your oldest best friends and from which period has she/he developed to be your best friend?

I have noticed that the period where people start to developed to be a good friend is somewhat at the secondary school agae - about 12-15 years of age. I don't mean that you can't develop best friends when you are older or younger. This is just mean that it is the age where you start to think about your life and think on your own (to have your own opinion). Therefore, the friends at this period are those that come along and share the thoughts in your life.

Maybe you could argue that your oldest best friends is from the kindergarten or primary school. But I would challenge you to think again that actually, it is about the age of 12 and above that you become closer; as you would get to know th eperson more and develop a good friendship. Maybe that you are just lucky that your old friends have grown along with you since kindergarten and then you just get to know the person better at the later age.

Anyway, it is just my thought.....