To # author:
1), you're just 40's, is too young for thinking about your retire. And you should think that how to make more money in The United States now.
2), I don't think current China's government will welcome you? because they 're just interest your money and other interesting same with the government in Taiwan.
For the interest from American and S.Korean, they can abandon their old "friend, comrade and brother" N. Korea, so you think that they will welcome you to come back the motherland for retire if you don't have enough money? So please make more money here, then think go back your motherland for retire when you get old.