When you are 85 years old, even if you take something to cure your Alzheimers.. realistically something else is going to get you shortly. The whole organism if failing at that point.
And not just slowing down the aging process, but actual reversal of aging damage. The opportunity is limitless from the perspective of 2012. I believe the USA is ahead of the rest of the world as usual, and now spending near on 20% of their economy on health care. I expect it to be 50% by mid century.
The biological body is of such astonishing complexity that we are talking millions of man years of research that is needed to go and figure out how to reverse this aging damage.