@Uncle_hitler
Could be a vampire or other similar races as well.
Maybe just how afraid they are when they mention it to her and compare it to how afraid they are towards the MC who they've seen do rather amazing things with spells.
That being said, Tina was just curious, but Schweith should've atleast come out with something like 'You haven't aged a day, in fact you're looking even prettier'. Though, considering how he reacted last 2 chapters with the nun... yeah, not gonna happen