The age of K2 visa to enter the United States and apply for green card is below 2 1 year.

Yes, the K2 fiance (wife) visa is for unmarried people under 2 1 year old. You must get married within 90 days after applying for K2 visa, otherwise the visa will be invalid.

K 1/K2 visa summary:

K 1 fiance (wife) of an American citizen, and K2 for unmarried children under 2 1.

Applicants from China must get married within 90 days after entering the United States with a K/KLOC-0 visa, otherwise they must leave the United States before the 90th day, or they will live illegally. K 1 visas cannot be transferred to other types of visas, such as student visas and work visas. If you don't marry an American citizen who applied for a K/KLOC-0 visa within 90 days, you can't change your identity even if you marry another American citizen. You must go back to China and start applying for CR 1 again.

K 1 After marriage, American citizens can transfer their identity for China applicants and their children, and they can get a conditional green card for two years in about one year. Within 90 days before the two-year conditional green card expires, American citizens must apply to cancel the conditional green card and apply for a ten-year green card. After approval, they can get a green card for ten years.

American citizens must apply for a green card for China applicants within one year after entering China. If it exceeds one year, their marriage will be invalid and they must return to China.

If China applicants have children, they can fill in the information of their children in the application form of K 1, that is to say, they have applied for a K2 visa for their children, that is, K 1 has its own K2. If children are not filled in, it means that children will not be applied.

K2 must be unmarried under 2 1 year old, and must be under 2 1 year old before entering the country. After entering the country, children can change their identity and get a green card (confirmed) even if they are over 2 1 year old.