The person in question also looks like she’s in her early 20’s. She had a chronic condition where she was basically in a waking coma but wasn’t “experiencing” stuff for a decade so it’s as if time had jumped from her POV because she has no memories of that period.
This gap is so disorienting for her that she identifies her age as 22. Being told her actual birth year causes confusion and distress, as it clashes with her sense of time and personal experience.
So? As long as the 2 parties are cool with it, it’s fine.
A lot of my friend group are literally old enough to be my parents, despite me being over 30. Do you call that weird?