Uh, the humans of Gondor were descended from Numenoreans, who were descended from the Houses of Edain, men who morphed from Neolithic kit technology to High Med

Uh, the humans of Gondor were descended from Numenoreans, who were descended from the Houses of Edain, men who morphed from Neolithic kit technology to High Medieval (pre-plate armour and gunpowder) by being uplifted by Noldorian elves in Beleriand. Unlike the humans from a certain other famous series, we knew the background of Gondorians all the way to their earliest fathers around year... 300? 800? Of the first age of the Sun. Now, discounting that... I agree, ME has really low population growth. Might be caused by Gondorians and Arnorians living to 200+, 300+ years old earlier, when their culture were established; when the blood grows thin and they live like normal humans, their cultures ossified already; 40 - 50 year old normal human grooms and brides aren't as productive as 80-100 year old Numenorian grooms and brides.