Apparently, at conception, there are 120 males for 100 females humans; probably because the Y chromosome is faster to reach the egg.
However, right from conception till birth, there are many more miscarriages of males foetuses (also because of the inability to replace the Y chromosome which is weaker).
Then, growing, it becomes even between the sexes, but then come solciological factors such as males taking more risks, being much more careless, waging wars and the mortality rate of boys and men his much higher than that of girls and women.
At the end of our life, there are much more older women than men.
"La femme est l'avenir de l'homme" sang Jean Ferrat
The woman is man's future.
Last night, on the french TV France2, an Afghan woman was invited (completely hidden under her veil) to explain what was going on. It was a powerful moment.

Raoul