Taking your keyboard example. Nearly all the popular keyboards haven’t been updated in a long time. They work (more or less) and so don’t need updates.
Under your system they would get achieved and new users wouldn’t see them.
How does your idea help in this situation?
It would be interesting to see this not including infant mortality.
From my understanding that is where most of the “life gain” in graphs like this have come from.
A graph of how much older people are living would be better represented “ignoring” for lack of a better word the babies dying