single people with no kids who can afford to support themselves usually don't qualify for the pell. Sorry, this is the way it is.... so yeah, i guess you would have to live in a cardboard box..(although doing so doesn't nec mean you'd get one!).
THere is no cut or set number, but don't count on ever getting a Pell grant or any other free money for school. You can get "Financial aid" to go to school though, because keep in mind that "financial aid" includes loans.