大家帮我翻译几句中译英吧

1.China has the largest population among all the countries in the world.
2.Many young people can not find good employments.Because there is not so many ocupations.
3.The discrepancy between the number of the two genders are giant.
4.The elder people can hardly compete with the youngers.
5.Some people are always complaining and even some of them suffers from schitz.