How do you use 'ge' or 'gege' in Chinese/Mandarin?
I know that it means older brother but it's for both genders right? Like a girl can call her older brother 'Luhan-ge' and a boy can call her older brother like that too. Is it only for real brothers? Wouldn't it be awkward to call your male friend like that?

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Answer

It's for real brother and someone older than you ,someone you respect. or in a joking way.
In the office if a senior staff help you done something ,you might say:" 王哥，真是太谢谢你啦！"in this sentence,  ge is just mean to be close.
A famous joke is "信春哥，不挂科" （Believe brother Chun, you can pass the exam）,chun is Chris lee,and she is a tom boy.

Answer

yes, and there's also 兄 = xiōng

لا تفوّت فرصة تعلّم لغة جديدة وأنت مرتاح في منزلك. تصفّح مجموعتنا المختارة من مدرّسي اللغات ذوي الخبرة وسجّل في درسك الأول الآن!