Where do you get living in a third world country? The numbers are reasonable ballpark figures taken from real people living in America. With spouses and kids and health insurance that covers medical disasters.
Assuming you have two adults here with an "income"* of 20k each, you've still got 3k spare. I'll bet after a few years of that you'll get better at it and can reduce your spending even more.
Keep in mind you've been conditioned into thinking you need to spend money to have a good time, i.e. Disneyland, movie theater etc. This is not true.
*NOTE: "income" could be anything you want it to be, it doesn't have to come from going to work.