Yeah yeah okay guys... I don't post enough on /. to remember to account for the site's high levels of pedantry. I'm making a casual comment on a news site here, not writing an article for Wikipedia, but here we go:
The general understanding by the non-pedantic is that when someone is said to be "dying" it means they have a terminal illness such as cancer* (the risk of which is greatly increased around 60/65 - source: http://info.cancerresearchuk.org/cancerstats/incidence/age/). To call age-related illness "dying" is exaggerating I guess, but only slightly as it's around the same age and the same sort of illness that I have in mind.
If you look at it technically (and quite pessimistically) then yes, we are dying from the moment we are born but very few people use the term in that manner.
Now, it's quite possible that the age of dramatically increased cancer risk (and similar) would increase along with our lifespan, but my comment was in context with the summary's comment of "That assumes that the life extension is all 'good years', and not a prolonged period of dementia and physical decline."
{*} In before "not all cancer is terminal": I mean cases where it has been diagnosed as terminal, and also cancer is just an example but a very common problem.