Human history does indeed seem to show rhythmic patterns of rise and fall, widespread excitability and widespread calm. The problem is in the specifics, the details, the charts and graphs.
What about the distant, projected future? Russian cosmists, immortologists, transhumanists, American and European futurists have predicted, that we (or at least our descendants) will enjoy such a long lifespan that it could serve -- practically -- for what we call forever.
According to Dr. Igor Vishev (b. 1933), a distinguished Russian scientist and philosopher, it is likely that there are people alive today who will never die. Just stop for a moment and think about that. Alive today. Never die.