Characters | Height | Age | Gender |
Touya Sagami | ~ 5 ft 5 in | 14 years old | Male |
Konoha Б Nanase | ~ 5 ft 2 in | 14 years old | Female |
Taiyo Tsukuba | ~ 5 ft 7 in | 14 years old | Male |
ANALYSIS OF THE ORBITAL CHILDREN CHARACTERS’ AGES

According to The Orbital Children Fandom Wiki, Touya Sagami, Konoha Б Nanase, and Taiyo Tsukuba are all 14 years old.
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ANALYSIS OF THE ORBITAL CHILDREN CHARACTERS’ HEIGHTS

We estimated the heights of Touya Sagami, Konoha Б Nanase, and Taiyo Tsukuba according to the average heights of Japanese children their age, as published by the Tokyo government last 2015 census.
We also compared this data based on the characters’ pictures from the show.
Based on this information, 14 years old Japanese boys, like Touya Sagami, stand at about 5 feet and 5 inches.
Then, based on the same source, 14 years old Japanese girls like Konoha Б Nanase has an average height of 5 feet and 2 inches. This figure is fitting based on how she stands beside Touya Sagami.
Lastly, we have Taiyo Tsukuba, who stands slightly taller than Touya Sagami. We estimated him to be about two inches taller at the height of 5 feet and 7 inches.
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Reference:
https://www.imdb.com/title/tt13351614/
https://www.netflix.com/title/81340914
https://dubbing.fandom.com/wiki/The_Orbital_Children
https://en.wikipedia.org/wiki/The_Orbital_Children
https://twitter.com/ninjamac/status/1487141275723653121
https://nbakki.hatenablog.com/entry/Distribution_of_14_Year-old_Boys_Height_in_Japan_2015
https://pbs.twimg.com/media/FKNjG3_VcAAIs5j.jpg
https://nbakki.hatenablog.com/entry/Distribution_of_14_Year-old_girls_Height_in_Japan_2015