Please realize that those articles were based on information that was entirely unqualified, and are basically meaningless. This is Statistics Gone Wild or Gone Bad, or something. It is just an enormously incorrect, misleading, and improper way to present this type of data.
You can't lump everyone together, even by age, who is having an AVR and say, "this is the average you're likely to live, based on the raw statistic." Each AVR is different, and some folks have a lot more going on with their hearts, their lungs, and other organs that "just" a leaky valve. Those other factors weigh heavily in determining how long someone lives afterwards. When you add those into the mix, it has a chilling and entirely misdirecting effect on the outcomes.
When they say the average 65-yearold lived only 11.2 years after the surgery, well, statisitcally they would: average male life span - with or without AVR - is 76.
There is no discussion of comorbid conditions (other illnesses the person has at the same time) in the younger people who were counted as well. Also, as I believe was pointed out, these statistics go back into the bad days, before al lot of the surgical techniques had been worked out and before valves were improved (although Dick skipped needing an improved valve, and moved right on to the "live an exotically long time after surgery" road). At the very best, those numbers are both unqualified AND twenty years behind the times.
Another thing that was vaguely alluded to in the article was deaths through bleeding issues. The advent of self-testing is changing those numbers by the day. The poorly executed "Coumadin Clinics" of the medical community (especially of the past) have likely been responsible for as many problems as they have saved lives, through misunderstanding the dosages. Not to mention the number of strokes caused by demanding patients and halt dosages for minor medical procedures. Mechanical numbers can and are being improved greatly, and thirty years from now, the statistics will finally show it.
This is like determining your life expectancy with fingernail cancer by using the merged life expectancy numbers of people with all the different possible types of cancers, including those with and without other, lung, and other issues at the same time.
Best wishes,