Is donor age or telomere length more important in determining how many cell divisions a cell will undergo?

Telomere length is the determining factor in the number of cell divisions a cell will undergo. The age of the donor is not a determining factor. That said, each time a cell divides, the length of the telomere shortens and once it gets to a certain size, the cell either stops dividing or dies off.

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.