If mailing documents, then you must include the Social Security number so that we can match them with the correct application.  Also, do not write anything on the original documents and please write the number on a separate sheet of paper and include it in the mailing envelope with the documents.
Will I be able to schedule an appointment to apply for benefits in my preferred language?
Yes, the online application will give you the option to schedule an appointment to apply for benefits in the language you need.
Btw, when it comes in applying for Medicare. Is it possible for me to qualify for Medicare at the age of 65?