it’s not odd at all. yes, physically she was 18 (mind you, 18 not even considered being a grown woman that’s literally a teen who’s barely even a damn adult lol) but she literally is mentally a child. the count adopted her when she was seven & from there she never got any proper education or even communicated with children her age. she experienced neglect & abuse. she was never 18 mentally which makes sense on how when time reversed she still acted like a kid. also, this is ignorant to say cause there are actual children & adults who experienced similar abuse like fl. i can’t think of their name now, but in my psych class i learned about how a mother fully neglected her child & never gave them the basic needs they needed so when they grew older they mentally were a child even though they were an adult. so, minus the time reversing, things like this can & have happened. this is one of the cases where it’s completely understandable that fl is with a ml who’s “younger” than her which in actuality he’s not & time just reversed.
I remember when y'all attacked me for saying it wasn't right to ship the fl (who is mentally grown btw) with a child even though she reincarnated into her younger self. "Oh but her mental age was young cause she experienced abuse"... thats still a grown woman and its very odd