I gather that your position is like that of the Longevity Organization, that aging is not a gene (or genes) but a pleiotropic phenomenon. If so, can I gather from that, that aging arose by happenstance, coincident with complexity?
Genes with more than one phenotype are pleiotropic. The genes that keep cells from growing out of control also impose mortality on cells. It's easy to think of these genes as being controlled in trade-off manner between optimization of one trait vs. lethality.