Green Card holders can’t bring their aging parents directly to the U.S. but they can become citizens first and then help their parents get a Green Card.

Green Card holders can’t sponsor their aging parents for a Green Card directly. They can become U.S. citizens, then sponsor their parents as immediate relatives, which is faster. They can also apply for a visitor visa (B-2) for their parents to visit the U.S. for a short time, but this doesn’t give permanent residency.