Yep, the top 25% AGI average is $80K according to the National Taxpayer's Union Foundation. But of course it all depends on where you live and taxes and housing costs specifically. In a big city (not including outrageous priced NYC, Chicago, and San Francisco) you can get by on $80K without owning a car and just using public transportation to get around (I know a few who do just that). 

Not for family though, just for singles and married no-children couples. In the typical suburbs a single income household earning $80K can buy a decent $200K house and drive two used cars and get by just fine with two or even three kids. No, they won't be going to Disney World every year or buying the latest iPhone annually, but it's certainly comfortable living with proper money management.