I am 51 also and was dx last year. I did not have any serious symptoms prior to a major flare. Now I often need a cane to walk. I tried a few of the DMD's but could not tolerate them. I would also suggest that you talk to your doctor about
copaxone. It has the least number of side effects. I have been taking a look at LDN, but there is only antedotal evidence right now regarding its effectiveness and it is hard to get most neuro's to prescribe it.
Diagnosed April 2007
Started betaseron -- May 2007 -- experienced allergic reactions after 2 weeks
Started copaxone -- June 2007 -- stopped after 4 1/2 months;experienced severe 5 IPIR's
Started tysabri -- December 2007
Stopped tysabri -- April 2008 (developed antibodies/severe reactions)