forms of address about age and gender

One I can think of is birth order within a family.
You would address an older sibling as older sister, but a younger by her name.

I agree with you. In Chinese Family, it is very important. we can't call the older by his or her name, but we can call the youger by his or her name.
if you call a young girl aunt not sister, it is also an inappropriate form of address .