There is a real possibility that in the next few decades some of these therapies might work. The book Lifespan by Dr David Sinclair is really interesting. Sinclair is a professor at Harvard. He's highly optimistic that something will come of the various ideas looking at slowing aging. https://www.amazon.com/Lifespan-Why-Age_and-Dont-Have/dp/150...
So when it happens, will we stop having kids? Because our current population and lifestyle do not seem sustainable. I only see population increasing and lifestyle being more burdensome on environment.
maybe immortal people care even more about the longterm well being of climate / ecosystem?