This book has investigated the presence of gerontoxon  in mental  disabled children  and youngsters with down syndrome and other health disorders, and also in mentally healthy children. The study was based on data from 81 cases wich are going to be  presented afterwards in the light of the studies of Battello, Jensen and others. The analysis of the facts shows that the gerontoxon  is present in most of the cases with diseases wich affect the central nervous system.