Even a simpleton knows that you can't extend life beyond its measure. What a few folk would like is to live up to that measure instead of dying decades earlier that that.
No you are wrong. Life is already being extended beyond the natural measure of most peoples predetermined existence via medical treatments and pharmaceuticals
Without the advent and advancement of modern medicine and all its treatments many humans would not be able to live well beyond the years that they are currently living up to in today's society. Most people in our society would more then likely of died 10-20 years earlier then the average age they are living up to right now and for which we see continual increase in relation to modern medical breakthroughs which continually seeks to combat nature's natural limit on our lifespans.
It is because of the massive expansion and advancements of for profit pharmaceuticals (and the medical treatments tied to them) that as a result has continually extended the life and well being of humans which is responsible for us living beyond the measure of our natural lifespans. However this ability has come at the cost of these same pharmaceuticals and the medical treatments being in some cases prohibitively expensive due to the limited resources involved, along with the effort and skill required to bring these items or medical expertise to market.
Nevertheless to try to mask these costs ends up with individuals not being able to determine the true cost and value of modern medicine and its ability to provide the improved care that greatly extends the lives of people well beyond their natural ability to exist if nature had its way. This in turn leads to many other negative side effects like waste of limited resources, eventual price increases due to a distortion on the amount of resources available, and a shifting and reassignment of many resources from other areas in society to continue keeping an every larger segment of our population alive at the expense of others in society (aka you are seeing this issue being displayed with the SS and medicare debate and their associated shortfalls), etc.