That must really depend on where you live, because I know a LOT of people making that kind of money who aren’t living extravagantly, but are definitely not living within their means.

They could be, with proper money management and a decent budget, but they generally aren’t. The type of income in that zone often tends to come with jobs that require physical presence in an area that’s really expensive to live, with expensive childcare and a need to have it; often people also own a mortgage and a car lease and eat their lunches at restaurants as part of the social networking needed to maintain employment relationships.