how old do you have to be for a factory job in minnesota?

I'm a 17 year old that just moved here from New York State (where the age limit for factories is 18) and I really need a job. I see a lot of factory jobs on Craig's list that pay a fair amount, but it doesn't give an age limit. Does that mean that there isn't an age limit or is it just supposed to be common knowledge what the limit is?