FAFSA has an age cutoff to decide whether or not you have to submit your parents information. Check their website to see. The individual schools however almost universally ask for parents info. So basically, if you are a non-trad (like me) you fill out FAFSA on your own, then provide parents info (usually just a copy of their tax return and maybe a short form) for the individual school.
Just a note of annoyance: it does feel wrong to ask my 70 year old parents to submit to a financial inquisition when I am absolutely taking no money from them. (Would you take money from a grandma on social security? No way!) Then again, the schools have made it very clear you get nothing over the federal $8500 if you don't submit your parents information, and I'm not independently wealthy here on my last five years working in public health. I thought I'd only have to put myself through this sort of pain, not my elderly parents too!!