61% lack Internet access [1]
35% lack basic sanitation (e.g., toilets) [4]
26% don't have plumbing (e.g., water they can get from pipes in their house or yard) [2]
23% don't have electricity [2]
14% lack access to clean water [2]
14% lack access to health care [2]
13% suffer from chronic undernourishment [5]
11% can't read [3]
14% is about one billion people. Maybe you look at that and think, hey, 86%, doing pretty good! But if this many people can't even get access to even the most basic of technologies today, what makes you think most people, even people in the developed world, will have access to whatever mythical mortality-defying technology people are speculating about here? It's all such speculation as to what they are doing, the question is practically not worth answering. But if extreme life-lengthening technologies are truly on the table, the potential for an Elysium-like scenario should be taken seriously.
(Also, point of clarification: what do you mean by "intrinsic reason"? Can you give an example of an intrinsic reason something would be limited to the elite?)
[1] http://en.wikipedia.org/wiki/Global_Internet_usage
[2] http://www.globalissues.org/article/26/poverty-facts-and-sta...
[3] http://www.statisticbrain.com/number-of-american-adults-who-...
[4] http://www.unwater.org/statistics_san.html
[5] http://www.worldhunger.org/articles/Learn/world%20hunger%20f...