Anyone else find this weird?

The cyrus girl is just now 25

And? He played her brother in the show.

It's the same thing as the old woman playing that ghost girl in the potter movies. Also he played her younger brother if I remember correctly.

No he was her older brother. Also a lot of the actresses in St. Trinian's were women in their 20s and 30s playing schoolchildren.

And my sister and I have a bigger age gap