Back to the original question...

I teach 10-12 year-olds, and in my class I have three girls who could be considered "tomboys": the girl with short hair and boys clothes, the girl who hates anything "girly" purely and simply because it tends not to be sports, the girl who has friends who are boys. Never once have I heard the word "tomboy" applied to any of them, so I think to kids it is an outdated word at least.