Multiple Sclerosis is a disease which affects around 18,000 people in Austrailia! So you are not alone. This disease is most commonly diagnosed at the age of 20- 40. It is estimated that about 2,500,000 people all over the world have MS. Around 45 % of people who have Multiple Sclerosis are not serverly affected by it. The risk of developing MS increases if you are a woman. It is not a contagious disease, but it is a progressive one because there is no cure for it.