According to the ULF (United Leukodystrophy Foundation) there are over 40 types of the disease, though the most severe cases include the aging backward. However, the difference is that people stricken with MS have an immune deficiency in which their own immune system attacks the myelin. In this sense, scientists have drawn correlation to MS ( Multiple Sclerosis ). Kitner also mentions the sadness of the disease in that it is in fact ternminal, and people like Matthew and Michael will never be able to live a full, happy life. Why exactly this extremely rare genetic disorder leads to grown adults suddenly acting like children is not yet clear. The myelin then affects (negatively) the white matter in the brain, which is key to development as a whole. Kitner ( President of the United Leukodystrophy Foundation ), people stricken by the disease have an imperfect development of myelin sheath in their brain. Yet, they are grown men slowly losing control of their motor skills, and their social skills almost completely gone. As their mother says, “I was up with them 7 different times last night.” They think like toddlers, eat like toddlers, and are infatuated by cartoons and trains. They previously held jobs and were normal functioning people, but slowly declined and now live with their elderly parents. What that means in reality is that in Matthew (39) and Michael’s (42) case, they are grown men acting as if they are infants. Brothers Matthew and Michael Clark were diagnosed with leukodystrophy, which is a disorder in which one of the symptoms include “aging backward”. As many of you may have seen, two men in Great Britain are starting to make international headlines.