They obviously all have a huge crush on you! It's the exact same thing as Edward Cullen in Twillight! Every girl wants him, why? Because he's good looking. Try and find someone who will really love you, mmm-k!
They love you, date them as much as possible
He's either the utimate hunk, or they know something "special" about him that's embarassing to them.
They love you WAAAY TOO MUCH
they are just impressed by his age. they can't date younger or older he must be really really really cute
He's the ultimate hunk
i don't believe people can blush dark blue but she may like you or think your an embarrassment =]
They're embarrassed or they love the guy
Have you had your eyesight checked lately. It is so highly unlikely that all college and university girls would blush, much less for the same thing (or person), it could be described as 'never going to happen'. You are obviously focusing on a limited number or type of girls. I know more girls of that age that would never be inclined to blush at any guy than would; they're just not that easily impressed. They actually have bigger ideas about life.
Blush is a very dark color. like dark red or dark green and so on. That is what blush is.
You stop being a creeper. Don't look much into it, or ask them~
People with all color do blush.
That means that they like that person