I was dx three years ago when I was 50 although I also was most likely experiencing mild symptoms for over ten year (partial numbness on bottom of left foot and fatigue). For the past two years my MRI's have not shown any new lesions. I wonder at times if I have already progressed to SPMS as my disability is permanent.

I have heard both versions regarding age. I remember when I was dx I asked my neuro about the likely progress of the disease. All he would say was let's see how you are in five years.

I am not sure it really matters. I also feel really bad for those that are dx at a young age. I am thankful that I did not begin to experience all of these problems until I was 50.