Here's an article featuring an apparently recent interview with Aubrey DeGrey:
http://www.livescien..._interview.html
Heh, I rather like the closing remarks, about oscillating between 20 and 25 -- sounds nifty and comfy to me.
Then all we'll need to top that off is to reduce the human fertility rate, so that our immortal population won't overbreed to the point of destroying the planet!