Everyone seems to forget that yes, Charlize has the mentality of being “alive” for like 400yrs but as a sword, an object. She went back in time but I think she lacks human experience. I think she got turned into a sword at around 17-18yrs old? So yes she’s old af mentally, but has no experience with human relationships, especially romantic ones. And I believe that’s she’s only like 3 years older(physically) than him.