You cannot register for Selective Service as an F-1 Student since you were only here temporarily and still permanently residing in your native country. Selective Service is mandatory for permanent residents who are under the age of 26. Since you were 42 when you became a permanent resident, legally there was no way for you to register and you were in complete conformity with the law.
Why do you ask?
Are you getting ready to apply for naturalization?
If so, go to their website and follow the instructions for getting a letter.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.
Generally speaking, all males between the ages of 18 and 26 must register with Selective Service regardless of citizenship. However, i
under these facts you were lawfully maintaining F-1 status until your 27th birthday. You were therefore not required to register with Selective Service since you were in a lawful nonimmigrant status during the registration period.
Consult with an experienced immigration attorney who can review your case and advise you how best to proceed.
While this answer is provided by a Florida Bar Certified Expert in Immigration and Nationality Law, it is for general information purposes only and an attorney/client relationship is neither intended nor created. You should seek out qualified counsel to review your case and provide you with advice specific to your situation. Review Mr. Devore's Avvo Profile for more information about his expertise in immigration law and how to contact him to discuss your case.