No, my youth allowance was my board, and it stayed that way until I stopped going to uni.
When I started working full-time then I started paying board.
I can't get over how many people I know who's parents let them have their youth allowance to spend on clothes or going out and paid for their textbooks, uniforms, school fees, etc out of their own pocket.
In my eyes, youth allowance is there to help cover the costs of your education. Any leftover can cover living costs, but it isn't personal teen spending money.