There are a lot of stories essentially based on what happened between Giles and Anya in Tabula Rasa. Anya is treated like a child so much, even when she has a very sexual relationship with Xander. She's actually older than any other character, even the Master. (Possibly Olaf is a year or two older?) She may be uncomfortable with her humanity, but she is an adult. Giles is an adult too.

Inara is so totally in control. I just wish Mal and Jayne didn't call her by that name.

Interesting set of canon.