Watched this PBS video on PBS... you might be interested.
How-these-penny-pinchers-retired-in-their-30s
https://www.pbs.org/newshour/show/how-these-penny-pinchers-retired-in-their-30s
MMM in person...
How-these-penny-pinchers-retired-in-their-30s
https://www.pbs.org/newshour/show/how-these-penny-pinchers-retired-in-their-30s
MMM in person...