Costa Rica is worth serious investigation for you, but it is not yet a green light for a permanent move. Your fully retired status, healthcare priorities, and interest in dependable living costs make it a plausible choice.
The distinction is between a country that can suit your life and a move that you can confidently carry out. Your actual income documentation, both spouses' residence arrangements, and a locally priced household budget still have to support the plan.
You can choose access rather than isolation
Costa Rica has both public and private healthcare, with many specialist and private-hospital services concentrated in and around San José. For a household that places substantial weight on healthcare, that makes a service-connected first testing base more useful than choosing a beautiful remote location first and solving medical access afterward.