here's a new science #rant on #aging :)
as far as biology can tell, aging is best understood, #philosophically at least, as part of a #developmental continuum between #embryogenesis & death, which is pre-programmed somehow. therefore, we cannot in principle place precise "boundaries" or "cutoffs" between development, adulthood, and seniority. In strict #biological terms, they are all part of one continuous #program. a complete explanation of aging therefore requires complete #devbio knowledge