Cause of aging

[Kate]

Steven B. Harris <sbharris at ix.netcom.com> wrote in article
<6raqbi$5kq at sjx-ixn3.ix.netcom.com>...
> 
>    Obviously it's achievable.  There are immortal plants (aspens) and
> animals (corals, maybe even lobsters).  Their mitochondria obviously
> don't give them any problems, and they don't get new ones from Mars. 
> Whether old mitochondria are repaired, or just produced anew and free
> of defect at a sufficient pace, is immaterial.  For the cell, it's
> repair either way.  Any process that makes new fresh cell organelles
> counts as "cell repair" in my book. 
> 
>                                     
> 
  What about the possibility of a selection process - with defective cells
being weeded out?  Non dividing cells can't afford to weed out.

                                           Kate