Will the nationality change after emigrating to the United States at the age of 70?

No, after emigrating to the United States at the age of 70, the nationality will not change. Getting an American green card will not affect China citizenship. The American green card defines the permanent resident status of the United States, that is, you can legally live and work in the United States, but the green card and the American passport enjoy the same welfare benefits. When China people immigrate to the United States, they must first obtain permanent residency in the United States, which is often referred to as a green card. After getting a green card, you must meet five years, live in the United States for more than half a year every year, and pay taxes normally before you are eligible to apply for American citizenship.