> I'd rather see a high quality of life for everyone on earth for 80 years than 150+ year life spans for the first world.

They aren't mutually exclusive goals; working on the social/political/distributional problems that prevent most people from having a high quality of life is not exclusive with working on the health technology problems that mean that no one is living 150+ years.

And I'd rather see a high quality of life for everyone on Earth for 150+ year life spans than either of your options.