"Just as a ballpark number, $50,000-100,000 per life-year is around the point where interventions are considered to be "worth it" when talking about things like screening programs. I really doubt that you'd get 20 years from the current BioViva experiment, but assuming you had something that would give you 20 years, it could be logically priced at one to two million dollars. I don't think that individual medical decisions are typically made this way, though. These days, the pharmaceutical industry is pricing some small-volume therapies at levels of $100,000 to $300,000 per year. On the other hand, people die all the time for want of basic medical care."
A treatment that added 20 years would save governments a fortune in health care costs, and if it was coupled with a 20 year increase in the retirement age, would save them a fortune in pension payouts. It would thus be worthwhile for the government to pick up the cost of the treatment, if it wasn't crazy expensive. Since it would be a very high volume treatment (most people would want it), there would be a large economy of scale. If it were something like the current BioViva experiment, I don't think it would be very expensive.
Liz Parish talks in one of her interviews about "how much will cost" once the platform is up and running. Figures are much more reasonable based on her comments and I do hope that is the case. 300k/year is not feasable and we will end up with a scenario like in the Elysium movie (which of course, can be the case).
One thing to keep in mind is that as technology evolve, this "reverse aging" will become more mainstream, including home-brew technologies.
And yes, if somebody in the government realizes that such treatment will actually reduce A LOT the health care costs and they actually will put MORE money in our reserve, than that will be a seller, and this field will ignite for good.