Earlier quoted context omitted.
"You're given a decent amount of time on this Earth, already make it count and move on." I hear this all the time, but I still can't wrap my head around it. If you value life, why wouldn't you want to sustain it? If you're content to die, why don't you get it over with?
I don't know how I feel about immortality or hyper-long lives (not sure which one you meant). It's a complex question. So I'm not agreeing or disagreeing with your conclusion. But your argument isn't very good. I've made one that is exactly parallel. "If you value pizza, why wouldn't you eat it forever? If you're content to one day stop eating pizza, why not stop eating it right now?" Replace "pizza" or "life" with "…
Regardless of any new contributions to ageing research, the reality is that in this century we have over a hundred countries yet to enter the first world where births per family nears ~2 and until then medical and social advances in those countries will explode their populations.
We are already unsustainable, so the problem of stopping people from spawning more is really unrelated to medical advances in the longevity of first world inhabitants. The population explosion is happening elsewhere but is still a real problem.
Not saying first world countries have nothing to work on. We still consume as many raw resources as 3 - 50 Africans depending on where you live.
At that, scientific progress is always essential. I don't want to live to be 300 where I spend 225 years a vegetable or that my quality of life still free-falls past 60 like it does today. Extending quality of life has the added benefit of meaning you get more bang for your buck per person - if you spent 30 years training a doctor from birth to functionality, and their quality of life starts slipping 30 years later, you only get 30 prime years from them. If you can keep them at middle-age fitness and well being for 70 years, you get significantly more doctor per time spent on the person.