Immortality Through Array Formations Ch. 180

Mo Hua, at the start of the story is ten years old. He does incredible feats, also quite some time passes. For example there was a time skip to the next winter, then spring. One would think that Mo Hua ages. However, Seniors and Juniors, in chapter 180 it gets stated again that he looks like a ten year old. I have a huge issue with that. So much time should have passed, he should be at least 12-13 (it even gets mentioned that when he did something incredible it was too unbelievable for a “teen”, I don’t consider ten to be a teen). Does anyone have the same issue?