It is based on the kind of disability, not on your age. It depends on your progress/status as to when they send the next CDR and that they also get behind a times, which I was warned about. Sometimes mine were at 3 years, 4 years, 5 years, 7 years, sometimes they even went 8 or 9 years later.

It varies as to whether or not you get a short form or a long form and I do not know the basis for this. No medical records or documentation from the provider are required at the time of the short form; it is just a questionnaire for the SSDI recipient to complete. I never received a long form, so I cannot say if documentation is required from the provider(s). I am sorry that I cannot help there.