Correct answer: Progeria. A rare autosomal dominant disorder, caused by a mutation in the LMNA gene. The patients' subcutaneous fatty tissue disappaers and their growth stops extremely early; the average progeria patient is 100 cm long and 13 kg in weight. At the age of two, the characteristics of progeria are obvious; a relatively large skull (because the rest of the body doesn't grow as long) and an old looking face with the veins clearly visible (because the fatty tissue is gone).
