Significantly prolonging human life will be possible once we fully understanding how aging is encoded in the human genome. There are already genetically modified animals which greatly exceed their natural life expectancy. Transhumanism is also about merging humans with technology. Pacemakers and brain chips already exist and we have to deal with the question how far we want to take this.
Who is going to make these decisions?
What if an anti-aging process is developed that is actually relatively cheap. Let’s say it can triple a persons lifespan if they start at age 20. Suppose it requires a treatment once a year and only costs $1000. But we are never told what it costs. So people are charged $100,000 per treatment. Who would not pay it if they could afford it?