I think you need more questions on your poll.

I am retired and answered as such. I am not on any of the DMDs and so, I left that blank.
I am also 65, but there was no question for that. There are many on Medicare, who are not retired and 65, some are on Disability.
As far as affording to pay for the DMDs on Medicare, some MS Meds are covered by Medicare. I'm not sure which ones, but I think Avonex is covered, because it's an intamuscular shot.
There are also other charitable avenues to take.
I wish you luck..