You dying at mid 30s instead of living until your 80s and 90s is also a natural thing. It's not desirable just because it's natural. But putting in practical t

You dying at mid 30s instead of living until your 80s and 90s is also a natural thing. It's not desirable just because it's natural. But putting in practical terms of "what do I have to gain?", let me say this: every species is carrying unique genetic information that we can learn and employ to our advantages. Maybe a particular species doesn't have anything we can use right now, but might have in the future. Letting it be extinct mean we lose that information forever. Genetic information is like nature's source code. Now imagine we can't write code, we can just use what's already out there. Every time a species dies, it's source code forever lost. Like... plants in the Amazon forest. A lot of them served as the material for medicine. We used their "source code" to fight diseases, and fix human problems. And we are losing genetic source code we never even had time to analyze yet! There are animals that can kind of rejuvenate, and they never die of old age. Imagine being able to "steal" their code and use it to make our health better! If they go extinct, we lost that source code. Forever. There's no going back, no un-extinction. And we can't go to other planets to analyze their animals, since we haven't found alien life yet. All we have is the life that is available, and we're getting rid ot that life fast.