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 think you're right there. Other worlds could actually make that viable, but we'll get the abilities in the wrong order.
And it should. I don't know what will happen, but I think it will get messy at points.
Ironically a lot of people are going to die over some next-level health care debates. That alone may reduce the population enough.
All we can do is continue to hope.
Well good news then. You and I will be dead from some of the last 'natural' causes, before the shit hits the fan.
Sometimes it pays to be an oldphuk.