You may have trouble getting into a private insurance plan but depending on the country (and sometimes depending on the community) you choose and depending on the type of residence/visa you utilize, you may find you have other great options such as getting into the public system or a hospital membership plan. True, most do make the move before the age of 80, and at any age there are a lot of factors to consider, including health, personality type, community ties, finances... but there are some wonderful 80+ success stories! Here's some inspiration:
https://members.internationalliving.com/articles/finding-adventure-in-retirement/
Plus you might enjoy this video of 81-year-old world travelers on the International Living YouTube channel: https://youtu.be/JSpt-xjkxFU?si=cs7RF78dCJ4BgkwE
Best,
IL Overseas Editor Jess Ramesch