This is important, so please do not forget that in order for a US citizen to apply or petition for a parent, the petitioner MUST BE 21 years of age, NOT one day less or early. I just came across a client who applied for the parent 6-7 days before the client's 21 birthday, however, the USCIS denied the petition. The client chose the option to reapply rather than filing a motion to Reopen, Reconsider, or to file an appeal with the BIA. Please do not forget this, and when it doubt check with an Immigration attorney. Good luck friends.