Age freezing generally applies to children seeking immigration benefits through parents. If you were born in the U.S., you are already a citizen and not affected.

The Child Status Protection Act is meant to protect non-citizen children from aging out of visa categories. It does not apply to people born in the United States. Turning 21 doesn’t change your immigration status. Your parents’ move to Canada also doesn’t affect your citizenship.

Because you were born in the U.S., your status is secure regardless of age. There is no immigration benefit you can “age out” of. The concept mainly concerns green card or visa applicants. If you have documents questions, it’s still smart to confirm everything officially.