I cannot imagine how frustrating your situation must be!
Is this neuro. an MS Specialist? How many MS patients does he treat?
I was diagnosed at age 60 by a PHD MS Specialist (head of an MS Clinic) This Dr. was so different from the general neuros (2) that I had seen over the course of 4 yrs. He was very well informed--about the disease, latest research, comparisons of CRABS, etc.
I had 10 brain lesions by that time----started out with 4. He looked at the total picture. Two episodes seperated by time and space, symptoms waxing and waining for years, test results etc. He has diagnosed folks over the age of 60 and also some children (under 17).
There is such a thing as late onset MS---also, it can be lurking for years, undetected. By the time you are diagnosed, you may be out of the so called age frame.
I hope you can find a neuro. that has the confidence and expertise to diagnose those who don't fit in the box, or don't fit an exact mold.