The trick is to retire without debt. If house and cars have no debt, we live easily on about $5000/month. At 4% conservative ROI would need $1.5 million investment capital.
If you have no debt and own your own home, you should easily live on far less than $5K net, unless you blow a lot of money on entertainment.
Inflation is the big unknown. Another stock market retreat and the the 60s-70s sideways movement will radically chang the equation. I think we will get all 3 (market correction, sideways movement and higher inflation). That radically changes the equation. Everyone might need a plan B where they live in eith a multigenerational home or a group home zLike them golden girls.
Your city revealed is a necessary piece of information on this thread. Are you in New York or Houston?