OK - i came up with a reddit worthy conspiracy theory.
Check it.
It doesn't effect kids,
had minimal effect on the working age, except for the ones that are on their way to future problems.
The healthy retired should survive
It is wiping out the infirmed - relieving the system of the overhead.
This was obviously created by the insurance companies and governments to move the wealth
and assets to the self-sustaining.
Go and re-read Logan's Run. (well, that isn't quite right, but close) Soylent Green is people.
just a theory. you know, cause this is the internet.