The one writing the numbers said they are based on his own calculations as well as those of two others. While he links to their work, he doesn't share any insight as to his own. What are his data? What are his assumptions based on? Etc.
One point in which this account departs from Stephen Wigmore's calculations are the population stats of
Aman, which I based on my own calculations based on the original number of
Elves having awakened at Cuivienen and 21 elf-generations having passed by the time of the kin-slaying.
21 generations? Where does he get that number from? Can anyone confirm that?
There is also a quote from
Tolkien about the (fixed) numbers of Elves within
Arda, but I can't find it right now (maybe someone knows what I'm talking about?).
if
the third age was as weak and weak as it was thought to be, why would tolkien write the third age
Firstly, the 3rd Age spawns more than 3000 years of the sun, meaning it started around 1000 BC our reckoning, which is approximately the Age of Assyria for example (just for reference) and still a long way from the classical Greece we all know, or from Rome. The 3rd Age had ups and downs repeatedly but towards its end it was undeniably an Age of decay. And that is also a very important part of the idea of Tolkien's story, if we talk about the
Hobbit and
the Lord of the Rings. He want's us to embark with him and his characters on a journey through
Middle-Earth seeing upon the
ruins of a greater, more glorious past.
Imagine for example (even if it gets an everyday sight for the people of
Gondor) living in the small
city (former
fortress) of
Minas Tirith and see the ruins of mighty
Osgiliath all the time. Or walk through
Eriador and see the ruins of human
places like Fernost or Annúminas or elven like Ost-in-Edhil. Those once mighty
cities are towards the end of the third Age all in ruins, and not only was there a lack of population to resettle and rebuild (at least parts) of them, but also no new settlements of similar importance or size emerged.
Certainly the beginning of the 3rd Age and I would say until the splitting of
Arnor, the 3rd Age was a time of greatness, of growth and prosperity (with mostly manish problems of its own). The decline begins at least since the return of the shadow maybe between 1000-1300. It wasn't noticeable at first maybe, but at the end you could easily see the rapid and drastic decline.
there does not seem to be a huge population difference between the first and the third age.
I disagree with this statement. There are many and complex factors influencing growth and population size (mostly speaking about humans now). And we know for a matter of fact, that the elven population in Middle-Earth of the 3rd Age was dwindling rapidly. The humans are a quite different subject altogether.
My concluding thought is: why is it so hard to accept the fact that the end of the 3rd Age was an Age of decline (both for humans and Elves)? And why does it have to be different?