I was diagnosed at 43 but ignored symptoms/was misdiagnosed for almost 10 years. Once I had a brain MRI done--that showed multiple lesions in patterns consistent with MS, my official diagnosis only took less than 3 months, which is very fast for MS.
I take Tysabri as treatment...an infusion done every 28 days. I was on Copaxone (daily injection) but was taken off that after I had a bad relapse.
Everyone's symptoms are different--so comparing yours to others is meaningless. Some people were never diagnosed until their autopsy--it depends if the severity of your symptoms are enough for you to seek medical treatment. As I stated, I thought many of my early symptoms (fatigue, brain fog) were just me getting older. I was thought to have had a seizure once--which resulted in a brain MRI--that enabled my diagnosis. There is no history of MS in my family.