to resident in other country visa or long term stay permit would be the first issue.
Normally:
1) you can married a local to obtain a long term permit or resident permit
2) start a business to obtain a legal long term permit
3) work for a company has the capacity to apply for a working permit
as this topic is retire.....seem like only option 1.
unless.....
fly-in and fly-out after every visiting visa
