I have done more understand that In all Muslims holidays, even if under 18 is able to enter the mosque, other general time can not enter.
Also, I'm confused, because I found a message, a student dormitory in the Linxia mosque, many students learning doctrine, all 13-18, need to learn 5 - 6 years. ALL student's goal is a mullah. This means that if future as a career, even minors can learn in mosque ?
Well, because I did not care enough in the religion, some other cases do not understand, need to know more.
there is no age limit to enter to mosque, you can go there in a very young age.