It depends on the city and the person and the job who has the longest commutes. My friends all live pretty close by on the edge of where city becomes more subur

It depends on the city and the person and the job who has the longest commutes. My friends all live pretty close by on the edge of where city becomes more suburban, but along the train line, and in most cases share and apartment with someone and we're all between late-twenties and almost 40. Almost nobody commutes into the downtown anymore though, they're commuting by various means to either a fixed workplace in another area, or disparate workplaces wherever the job is that day. But their home base is where people are. The poorest people are on the street or in an old place, or a roommate situation.