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Yk how in canon while it is said that cultivators do age physically they don't gain the average aging features (such as wrinkles, white hairs etc) I need me an au where wwx never regains his core so while wangxian do age together and grow old together, Wwx ages normally while lwj doesn't:
Wwx: ahh.. lwj i don't know why you stay with this old man..
Lwj: Wei Ying we are the same age.