Over at PubMed Steven Austad provides a good argument for considering aging as unprogrammed decay rather than a programmed process in the body. This sort of high level thinking about processes and purpose - like the reliability theory of aging - is an important part of effectively directing the research community. "Aging, except in exceptional cases such as the rapid decay and death of Pacific salmon, is not design but decay. The decay of senescence is not due to natural selection's designing hand, but to its absence. The empirical difference between programed and nonprogramed senescence becomes evident when comparing the stereotypical steps leading to death in salmon contrasted with the lack of such stereotypy in most organisms such as humans and mice."

Link: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15379846