My aunt, who is a US citizen, filed an application to sponsor her sister (my mom) to immigrate to the United states. My name was on the application as children of my mom. My aunt filed the application in 2003, and at that time I was 17 years old. As far as I know, the waiting period for this case would be 10 to 11 years and I must be under 21 in order to immigrate with my mom. However, I'm not quite sure how the age limit works. Do they consider my age at the time my aunt filed the application (in 2003) or when my mom gets the visa to immigrate to the states (around 2013)?

Please let me know. Thanks much.