Today the number of people that don't have to work, both in raw numbers and as a percent, has absolutely skyrocketed. I mean if a person is simply interested in e.g. pursuing research and not so much with material niceties then it's extremely easy to live abroad in developing nations, indefinitely, starting with around $200k. Bump that up to a million and you can live practically anywhere so long as you have the discipline to live far below your means, which is perhaps the hardest part of it all.