It is unfortunate that future medical breakthroughs will very likely slow the aging process, at a point in time when climate change, among other trends, will make life Hell here on Earth. We will be able to slow the aging process, but I'm guessing it will not alter the average lifespan. That is because the remedies will be readily available to the wealthy, and scant or unavailable to most of the world's people. We may see the average lifespan of billionaires twice as long as average people. And they will live in small isolated enclaves with top technology to make their long lives survivable, while the bulk of humanity will be fortunate to escape their hellish world at a much younger age.

That is, if current trends in just about everything (climate, inequality, population growth, diseases, war, terrorism) simply continue as they are now.