Many people enjoy working, being busy, progressing their career, feeling productive, buying lots of consumer goods, building their earning potential. These are mostly the expectations of our parents, school, work-life and society in general. The idea of being 'successful' is sold to us at a very young age!
Other people sooner or later realise that they dislike the corporate world, value independence, their time and the freedom to take life at a simpler, slower pace.
How is it done? Well, here's a very simplified example...
Suppose you begin work age 20 until age 40. You buy a modest house. Never take on debt other than a mortgage, which you pay off as quickly as possible. You save half of what you earn after the mortgage payments are accounted for and invest it in a stocks and shares portfolio. You also invest as much as possible in a pension (or several pensions).
By the time you reach 40, you own a property outright. You no longer have a mortgage or housing costs. You have no debt. You are used to living on half your salary. You have 20 years worth of savings invested. You have a pension pot.
So from age 40 you live off your savings for 15 years until you can access your pension age 55. Maybe you have a part time job which you enjoy, with minimal flexible hours and very little stress - because you know you are already financially secure. You top up your NI contributions to boost your state pension later in life.
Nobody else is paying for you for up to 60 years - it is a combination of prudent financial self-management, foresight, and a clear vision of which priorities are important to you. And these priorities mostly contradict the prevailing ethos.
It's also a different outlook on the utility of money and it's value. Money - viewed as time, the freedom to make choices and to provide security.