I was a mature student, and I lived in Halls for my first two years at university, then moved out in the third year.
I was at Keele, which is outside Newcastle Under Lyme, so, when I went there, the majority of students lived in campus, because public transport was not great, and most didn’t have cars, so it was more practical.
I enjoyed living in Halls, and it meant I was able to make friends who I could house share with, and didn’t have to go into a house share with strangers, which I would have disliked intensely.
It is horses for courses - some mature students will like being in halls, as I did, and others will prefer house sharing - I don’t think there is an arbitrary cut off age at which it becomes inappropriate.