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Well, the treatment, when and if it comes, would be most likely very expensive and labor-intensive, thus most emphatically not for everybody. (What was the name of that basketball star who got AIDS some 15 yrs ago? He's still alive, IIRC, making the same point). Thus you are right - the question becomes who gets treated. And those who do get the treatment would provoke such a degree of envy that they would need to spend the rest of their very long lives in protective custody.

Well, the treatment, when and if it comes, would be most likely very expensive and labor-intensive, thus most emphatically not for everybody.

I have to say that's a very short-sighted objection. ALL new treatments and other new developments are initially very expensive, but then decline rapidly in cost over time (or are replaced by far cheaper and better alternatives). TV's, VCRs, computers, DVDs, etc. were once few in number and available only to the very wealthy. Now they are ubiquitous. Heart bypass surgery is still fairly expensive, but hundreds of thousands of operations are routinely performed and vast numbers of people are alive today as a result. We are a rich society and continually getting richer.

Longevity treatments will likely follow the same path. Within a few years they will become routine and cheap and widely available to anyone who wishes to live beyond the historically typical life span.

What was the name of that basketball star who got AIDS some 15 years ago? He's still alive, IIRC, making the same point).

Magic Johnson.

Thus you are right - the question becomes who gets treated.

Eventually, the cost of the anti-aging treatment will become so low that it would be available to everyone. (A modern cheap pocket calculator is several times more powerful than the early room-sized computers).