According to John Hopkins Website:Myotonic Dystrophy is a very rare genetic disorder that affects people ages 60 years old and higher. If you have the disease, you will lose a lot of your muscles, and it affects muscle function. So far, no cure has been found. There are 2 types: Type 1 and Type 2. Type 1 may be apparent at birth, while Type 2 is milder and usually occurs at ages 8-60. This rare disorder can occur at any age, and treatment can help some symptoms, but cannot cure Myotonic Dystrophy.