Do unicellular organisms age?

Robert Luly luly at
Thu Jun 1 08:07:44 EST 1995

Oliver Bogler (obogler at wrote:
: In article <3qd1fe$bl5 at adelbert11.Stanford.EDU>,
: cpatil at leland.Stanford.EDU (Christopher Kashinath Patil) wrote:

: > Do unicellular organisms age? 

: > 2) Do all multicellular organisms age? If not, what is the complexity thresh-
: > hold for aging?

Leonard Hayflick addresses this issue in his (1994) book, "How and Why We 
Age". It seems that the answer depends a great deal on your definition of 
the word aging.
Hayflick sites many species, lobsters, many fishes and sharks and some 
reptiles (tortoise) and amphibians (aligators) that do not age (or 
at least age at a *very* solw rate) but he is careful to point out that they 
are not immortal. A common trait in non aging species is they never stop 
growing. This is found in chapter 2 of his book.
R. Luly
                                             luly at

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