Something weird that I just do
I call people child (and kid sometimes)
No matter how old they are or what gender they are
They are child to me
34 year old man? Child.
2 year old? Kid.
16 year old girl? Child.
That kid who is in the grade above me? Child and kid.
The only exception is people my own age or people I know personally.
The reason I do this is because child and kid are gender neutral names
So it's easier most of the time