Well, IMO it may be correct, since:
persons of senior status in addressing or referring to those of junior status
this may imply that Fractal views her as a junior because of her age (as he said correctly, he is elf, and it is difficult for her to say how much older he is than her)
Also...he deffinitively is senior to her in things like running, knowledge of the outside world (it impress me that she has only limited knowledge and even possibility to talk to outside people, that are not her clients)
And I (EDIT: definitely) love to see that by saying that, it can be considered intentional minor diplomatic "insult", that replies on her bigotry she tries so hard to hide...