Seriously, how do you use -chan and -kun in Japanese?

Question:

I'm really confused. In a magazine I read, both are used for familiarity but no gender was mentioned. But from what I read here in the net, they say -chan is used for girls while -kun is for boys. However, I also saw a show that a boy uses -kun to a girl. So seriously, I want a fit answer.


PLEASE DON'T JUST COMMENT. I WANT AN ANSWER, NOT JUST YOUR COMMENTS.

Answer:

Usually,
- chan is used for children (boys and girls) until approx 6 years old (before they enter the elementary school).
- kun if used for boys above 6 years old.
san is used for girls above 6 years old
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exceptions:
- when your boss calls you, kun is used for both men and women
- some women still use chan when they call their close friends
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note:
- there is no strict rule for the usage of chan except for the pre-elementary school children, but it always has a connotation of 'closeness' or 'intimacy.'
- among adults, kun is oftentimes used to express the 'relations' or the 'distance' between them. for example, 1) we never call our elders and boss 'kun;' 2) when we call our friends (of about the same age) 'kun,' we feel a certain 'distance.'
Very ambiguous, isn't it? I admit. But, language is not mathematics; there is no equation to solve our human feelings. Because language is the tool to express our ambiguity and complexity.