All kinds of misinformation over this thread
Most benefits are available to anyone 18 plus subject to qualifying criteria being met.
As for the Working Tax Credit, the rules in terms of age and hours per week you have to do to qualify are thus:
18-25 year olds - Not eligible regardless of hours worked (unless they have kids in which case its 16 hours or more)
25-50 year olds - They must work at least 30 hours per week (unless they have kids, in which case its 16 hours or more)
50+ year olds - They must work 16 hours or more to qualify.
Of course any entitlement to working tax credit takes into account as well but thats a far more complicated issue which I'm not doing to touch (its calculated on earnings in the last financial year, or current financial year included 'predicted earnings'...headache all round if you're in a job with variable hours such as agency work or have lots of overtime etc).
As for moaning about not qualifying for working tax credits due to your age - well perhaps you should not have taken on the financial commitments that you did without the means to fully support yourself, or without checking whether you would be eligible for working tax credit before you commited yourself. Why is it the states job to help pay for
your rent, bills and car?