I agree but "old" is kind of a concept. I think, for exemple, if you don't age you keep being "young" : you keep being seen as young because you live like a young person (your movements, your relationships, your social context, your ambitions), etc. Being old, is mainly about being considered old by the rest of the world. Age is not, in my opinion, a criteria here.
but that concept is different? example from another comment, a vampire who never ages and stays 17 forever, they will have a different experience socially and mentally bc of the body they hold, the way people treat, react and experience youth! The MC here went through the motions of aging and experiencing the different stages of life bc of her outward appearnce aging! just like rn your age compared to 60 you have different mentalities, but yeah its just not right imo
honestly no matter how pure its weird that shes actually 60...in a young body? bc her soul and body are old??? like if my grandpas soul went to a 17 year old body THATSD WEIRD MAN seeing him date a young girl? like idk vibes aint clicking when u think about it, unless u forget that part and can read this go ahead