Maybe before go abroad 1 year test living.The way the cost of living is calculated is extremely misleading. Many so-called cheap tropical countries are very expensive to live at the standard and safety level of Europe. Very many things must be imported and are extremely expensive, and one pays extra e.g. for house security or reliable internet which are taken for granted in Europe. A medical care or cultural offer at a certain level could simply not exist. It is not compensated by cheap street food, a t-shirt or a wooden cottage.
A good advice: in any case, before moving abroad, don't go just to a beach or a city centre. Go to a local medical clinic and a hospital, walk around, thinking whether you would dare to be treated there.
Nevertheless, one can move to e.g. Malaysia or Thailand or Costa Rica for 10-20 years, after one retires and before health really deteriorates. Keep an option of spending your final years in Germany, preferably in the outskirts of a big metropoly, so you have the benefit of a lower rent and calmness but short distance to services of the city.
I expect that Asia might overtake Europe in a standard of living in the next decades, but it might go together with rising costs, and an expat might not benefit from e.g. growth of the local industry.
In Doi Luang Chiang Dao ( North Thailand ) area I met one Britain which change living place each year.
But I think sometime must come the final decision for living place.