It's hard to pinpoint an exact generation where I stop caring. Here's how I like to think of it.
If every human alive today died instantly and painlessly, ending the human species and potentially eliminating all sentient life in the universe, I wouldn't care. The people felt no pain, experienced no dread.
The only reason to care in that instance is if you believe that the human race has inherent value just be being alive. That's what I don't have.
Now, the interaction of this philosophy and the real world isn't always clean but in general, it leads me to prioritize current human life over future human life especially over the long term.
So, for example, a dollar spent feeding a hungry child today takes precedence over a dollar spent exploring the universe even if that exploration lays the groundwork for humans being a multi planetary species 500 years from now.
It's a strange position. There will always be hungry children until we fundamentally change human nature.
I'd argue we're more likely to change human nature through space colonization than here on Earth, but that's a debate I don't expect to see much value from.
