It will cost thousands or millions to gain some years. Look at cancer treatment, their price are correlated with what social security can afford not with the cost to produce it. The worse is when a molecule is useless or just used for some stupid things like headache or some kind of flu and some research demonstrate that it can be used to treat cancer, the companies rise the price as high as they can.
Any reverse aging treamtent will also go this way, and what pharmaceutical companies will try to do is make one that have to be taken constantly. If they find a pil that stop your aging forever (or that you just have to take once in a decade) they will not sell it, or for millions a pil.
Conclusion : we can only hope to become millionairs or even billionairs to have acces to this kind of medicine imho.