Teenage Birthdays

15-year old girl, whose dad comes to every lesson.

Dad: Next week, L is in exam block, so we won't be coming to a lesson then... And the week after that is her birthday.  She tells me it's in her contract [smiles] that she doesn't do lessons on her birthday.
Me [smiling]: Oh, I understand.  I totally agree with that, actually.  So how old will you be turning?
Girl: 16. [Grimace] Ancient.
Me: What's that?  Ancient?
Girl: Yeah.  16 is ancient.  I will be ancient.