Here's an essay from Aubrey de Grey in one of the recent issues of the Journal of Evolution and Technology: "A pervasive reaction to the idea of extreme or indefinite postponement of human aging - one heard from many professional bioethicists and also from a high proportion of the general public - is that aging differs morally from other causes of debilitation and death in a manner that exempts us from the duty to combat it that we perceive as so self-evident in respect of those other causes. Precisely what characteristic of aging underpins this alleged distinction? I argue here that it is in fact a false distinction, perpetuated only by unwarranted psychological forces posing as philosophical arguments. ... There are many conspicuous issues regarding which contemporary Western society generally takes a different moral view than it did a century or two ago. Slavery, universal suffrage and homosexuality constitute a representative selection. In all these cases, the view that originally prevailed was overturned because the arguments for the status quo were eventually seen to come down to no more than a fear of the unknown, a faith in the 'natural order' and other similarly unrooted emotions."

Link: http://jetpress.org/v18/deGrey.htm