How Commom is Multiple Sclerosis in people in their Mid Twenties?

And what were your symptoms?

I would look into lyme disease and different stages before taking a wacked out MS diagnosis. Then I would eat an alkaline diet for about a year and make sure I have b 12, folic acid and floradix iron for energy and oxygen levels. I would also work out, swim and lift light weights.

Usually, a patient is diagnosed with multiple sclerosis between 20 and 50 years of age, but multiple sclerosis has been diagnosed in children and in the elderly. Multiple sclerosis is twice as likely to occur in Caucasians as in any other group. Women are twice as likely as men to be affected by multiple sclerosis earlier in life.

MS has a wide range of symptoms. It may take months to confirm a diagnosis. Tests are done to look for MS and to rule out other possible causes. Some diagnostic tests used are:
Blood work - look for Vit B12 deficiency and Lyme disease markers
MRI scans with intravenous gadolinium - identify and date lesions (plaques) in the brain. Newer lesions show up brighter.
Evoked potentials - hearing, vision, and motor impulses are tested to see if they move normally or too slow.
Spinal tap (lumbar puncture) - cerebro-spinal fluid is tested to identify cells that suggest MS. Can also be used to differentiate from Lyme disease.

For a definite diagnosis of multiple sclerosis, at least two separate symptomatic events or changes on MRI and a physical indicator (i.e. change in the central nervous system) must occur.

Very common. I was diagnosed at 27 but my doctor suspects that I had it as early as 17. 20's - 40's are usually the age of diagnosis. Since it usually takes awhile a a few different doctors to get the diagnosis. My doc ran the gamut from Menaire's (sp) disease to a brain tumor before get the MS bomb.
But as the 1st poster said it could be other diseases that carry similar symptoms such as Lyme disease, Parkinson's etc.

I was 30 when I was diagnosed, but had symptoms for about 5 years. My Mother was 59 when she was diagnosed, but had symptoms for decades.
Like someone else said, it is usually diagnosed between ages 20 and 50, but can actually be diagnosed at any age.

Its usually diagnosed in your late 20s and 30s, however i was diagnosed in my teens which is not all that common.

I dont think it is uncommon. Most ppl are diagnosed around 20-50. I was diagnosed 4 days ago and i am 25.