By the time children today are old enough to die from natural causes, we'll have a cure for that.
At some point I think we will 'cure' cellular senescence. Then humans can stay physically in their prime, indefinitely. But there are other limits, like memory. Because memories require physical space, there is only room for a limited amount.
I think we can get past that either naturally, by overwriting old memories, or artificially, by augmenting memory with technology. Research is already looking at brain augmentation with electronics.
So what will be the ultimate limit? Or will humans achieve immortality?
I would generally agree, but it's gonna happen anyway.
There will be very severe consequences, and I can't even guess how it will end.
Maybe if we colonize other planets, or start more wars.
It would be somewhat mitigated naturally, since anyone with access to that level of prosperity is likely have low birth rates, anyway.
I would suspect birthrates may fall even more since some motivation toward having children is to pass on genes. It's another way to live forever.
Like it or not, humanity will always seek to prolong life. If I think about living forever, I agree that it doesn't sound like fun.
But if you will never die of natural causes, do you think you would wake up one day and feel you've had enough, then suicide? Or Maybe just opt-out of medical treatment at some point?
You could end up accidentally becoming immortal if you don't plan a premature death. :)