How can a H4 Dependent Student Study in US college with a Pending or Approved I-485 when he/she reaches 21 Years ??

Assuming that you still do not have final visa availability at the time that your son turns the age of 21, your son may decide to put in an application for F-1 change of status although there is a good chance that it will be denied because of the immigrant intent that he has exhibited through filing the I-485 application. Barring a change of law, your son is only given credit under the CSPA for the period of time that the I-140 petition pended with USCIS. I note that as long as anyone's I-485 application is pending, he or she may continue to stay, study, and work (as long as he or she has employment permission). Hopefully some new law is passed that would alleviate his situation if you encounter the worst case. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.