Premature aging syndromes are a group of genetic diseases in which the children develop aging feathers. The premature aging in these disorders is not a result of aging rather a result of defective development. The abnormality on tissue structure is the common point between normal aging and premature aging. The defective development in these syndromes results from mis-construction, whereas normal aging results from Misrepairs (mis-reconstructions). Construction-reconstruction of the structure of an organism is thus the coupling point between development and aging. Mis-construction and Mis-reconstruction (Misrepair) are the essential processes in the development of aging-like feather