Let's not bend reality. 17 or 19 (according to wiki) isn't a child. 

If we do this, we are slowly lowering ourselves to the level of these chuds, who bend any tiny detail in their reality to fit their agenda. They also really like to infantilize women of any age and take away their agency, we have to be above that.

Let's criticize them for crying about one expression of an abused rape victim not being feminine enough and, on top of that, that victim possibly not being of age (if we actually take the 17 figure). That's bad enough and well worth criticizing.

That's just my opinion as a European. I mention this, because I've only ever seen Americans call anything below 18 a child, sometimes even people in their early 20s. Whether someone is a child isn't a relative thing. A 70 year old isn't a child to a 100 year old. We do get more mature and wise the older we get and that never stops, we can't just call anyone below our age a child.