Having Thai kids is not a requirement.
Having an income of a certain amount and paying tax is one.
Even a pensioner can come to Thailand, get the right visa he needs to get a work permit, get a job and pay taxes on it.
He can even start a company and make himself director with a paid salary and pay income taxes.
Because you are over 50, you have no obligation to apply for a retirement extension, you can still work if you want.
So please explain again why it never can happen for you