The Hayflick limit (or Hayflick Phenomena) theory discovered by Leonard Hayflick and a biologist in 1966. In vitro study, the number of times a fibroblast diploid cells will divide before it stops. The discover is conferring a major hypothesis if the cell division can prolong in a infinite matter without conditions which cause damage of the cells, then organism can liver forever.
Since stem cells can continue to regenerate new cells for the entire lifespan of the organism, without limit, thus constituting a notable exception to the Hayflick limit theory.
Cancer cell in biological aspect, have found a way around the limit by becoming a group of immortalized cells produced from cell division that have no limit as to how many times this immortalized cell division might take place.