Gondor was founded by the Numenoreans, a race that lived thrice that of other mortal men. Therefore, it would stand to reason that a longer lived race would not have to reproduce itself so quickly as a race that does not live as long.
Rohan was founded by a race of people who emigrated from the north. There may have been many more people still there, plus we do not know how many people inhabited the lands to the east and to the south.
Additionally, I believe the plague decimated much of the population of the Rohirrim that also coincided with the Fell Winter.
But I could be wrong.
Merry
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"If I yawn again, I shall split at the ears!"
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