The answers are not easy
theories regarding the causes of
aging, each plausible in its own domain, each
with its own group of proponents, and each
based on credible research evidence.
theories are like the blind men of fable
who feel only different parts of an elephant.
That is, each aging theory is valid in its own right
but presents only a small part of the picture.
larger unified theory of aging is only now
starting to emerge.