Just a little under your age, was hoping Vietnam would be over before I got out of HS. And it was, barely. I still joined, did 20+, retired, saw what was going on around the world and never thought the US would follow suit. Unfortunately it seems to be, and in our lifetimes.
Parasites move to another host when the old host dies or cannot support them. There is no other host available, so eventually the parasites consume each other and die off. With any luck, we will have left enough of ourselves for a new host to survive and fight off the parasites.
We can only pray that this happens.