Sankaku Channel/girl

Girl usually refers to a young woman, a child or a very young woman in her teen years. Such woman can't virtually be distinguished from a child.

But his word is used in Sankaku Complex as a reference to feminine gender (all woman) in general and specifically for identify the number of girl in a picture, like in crowds (e.g. Going out with girls.).
Can also be used as a nick for a lover (e.g. My lovely girl.).

there is tag for young, or old boys and girls more appropriate than girl

mature or milf for exemple.

to define the number of characters use those tags :

• 1girl (if there is no other character with the girl you can also use the tag solo)
• 2girls
• ...
• 5girls
• 6+girls (for 6 or more girls)

Child of the following tags:

grisaia no kajitsu, kansen 2 ~inzai toshi~, faint tone

This tag has been aliased to 1girl.