How many head hairs do you loose everyday?
About 100 strands of hair everyday on average.
Just because your hair is blonde, brown, red, whatever, doesn't effect the number of hairs on your head. In hair there is around 100,000 follicles, and each follicle can grow about twenty individual hairs in a lifetime. There is no average number of hairs on a human head, and no one really can tell how many hairs they're are on their hair. Hair comes in different sizes, shapes and lengths, just like people:)
Assuming no balding guys, then you have the problem of hair color. Blondes have less hairs on their head then dark-brown haired people. Red-heads have a different amount too. Then, I ask, do you want to include facial hairs or just hair-cut hairs? So are we using a weighted average (10% blondes, etc.) or not? Anyway think upwards of 100,000 hairs and then there are the adjustments.