I have talked to someone who was diagnosed at 7. Not sure about anyone younger. Her name is Leslie Hunt and has worked with the LFA of Illinois. Do a google on her and you can find information. Leslie is in her mid 20s and doing very well now after having some very rough times but now leads a normal life and is pursuing a career in music.
Mixed connective tissue disease (systemic lupus, scleroderma, polymyositis), Raynauds phenomena, Hypertension, Barrett's esophagus.
Meds: prednisone (6mg & tapering), 75mg imuran, lisinopril 40mg, maxide 37.5/25mg, norvasc 5 mg, folic acid, potassium, aciphex 20mg, multi vitamins.
Maintain your optimism and you can beat the odds.
"Although the world is full of suffering, it is also full of the overcoming of it." Helen Keller