Senescence occurs in every living organism. Revolutionary studies of McClintock, Blackburn and Szostak led to the discovery of telomeres, telomerase enzyme complex and telomere shortening-related aging processes. Current scientific knowledge brings the scientists closer to the recognition of the basic courses and processes behind organisms’ senescence, although this advance seems to be more regressive than progressive in modern days when multiple studies discover new possibilities and bring even more questions than answers.