Assuming the metal sheath over the dark brown house covers thatch last laid down in the 1940s, this building is the oldest in the picture, say, built in 1930. Everything surrounding it replaced an earlier building, possibly from a similar time as the dark brown one. The only exception is the foreground open field. Whatever once stood there never was replaced. Perhaps wartime vegetable gardens occupied the space left behind from tearing down something previously on the ground. Continuing with dates to guess: the light brown siding of the right-hand house is maybe c. 1985 and the beige building with two gables is 10 or 15 years after that, say 2000.
Taken all together the buildings in this photo are a kind of composite for many parts of central Nakatsu, with housing stock of different decades standing together, but with anything before 1950 relatively rare to see.
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