Do all you BOYS out there like blondes or burnette girls BETTER?!

Do all you BOYS out there like blondes or burnette girls BETTER?

There is a theory I've made up. And the theory is that men have made themselves an instinct that makes most common males want young and healthy females over the "not-so-young-and-healthy". What does being a blonde have to do with that? Blonde hair colour means pure and pure means youth. Over the age hair colour could turn into an older colour, which could mean less pure. The healthy part means slim, (in my humble opinion: not barbielike "slimness" cus she looks quite sick when looking at her plastic waist) but that isn't the answer for the main question.

So nowadays I think blonde equals to youth, brunette equals to middle-aged (no offense to anyone), and most of the men like younger women. I think this is just how males see females on the outside.