Living at home and working isn’t really a problem, but entering the labor force at 40+ is not going to go well.
We ran a huge deficit this year supporting the economy during covid. We are also seeing a spike in short term inflation and a weaker dollar. Treasury bond yields remain low but there is increasing speculation that decades of low rates could soon reverse.
Also are you attributing all value generated by Bezos's or Musk's companies to only them? What about all of the great people they employ?
https://www.cnbc.com/quotes/.DXY
Short term inflation is rising, but this has more to due with supply and outputs being constrained due to Covid and inflation rising from an abnormally low base. Many pundits and experts underestimated how quickly things would come back, even with the help of stimulus. I think having rising inflation and a booming economy is preferable to a weak economy and low inflation.
Not everywhere has money. I'm from a place where mortgages (with PMI) plus property tax are under $600/mo, families mostly own one vehicle (a van or truck), and people outside of regular blue collar either work six months out of the year trucking, at one of two local corporate offices, or hold multiple jobs part time (30-32 hours per so they don't ever get benefits).
That's how a lot of America lives, and that's who Medicare4All, free higher ed, and federal funding for K12 helps the most, which would do a lot to build and reinforce our lower middle class.