Characters	Height	Age
Kotaro Sato	~ 3 ft 7 in	~ 5 years old
Shin Karino	~ 5 ft 7 in	~ 25 years old
Isamu Tamaru	~ 5 ft 9 in	~ 35 years old

EXPLANATION OF KOTARO LIVES ALONE (2022) CHARACTERS’ HEIGHTS

We estimated the heights of the characters based on their anime appearances, how they stand beside each other, and the average height of their nationality.

According to Baby Center, boys of Kotaro Sato’s age stand at an average height of 3 feet and 7 inches. So, we designated this to be Kotaro’s height.

Next, as per Healthline, Japanese adult males are at an average height of 5 feet and 7 inches. Since Shin Karino is shorter than Isamu Tamaru in the show stills, we estimated him to be about this height.

Finally, we estimated Isamu to be about two inches taller than Karino at 5 feet and 9 inches.

EXPLANATION OF KOTARO LIVES ALONE (2022) CHARACTERS’ AGES

According to IMDb, Kotaro is about four to five years old.

Then, we estimated Karino and Isamu’s ages based on their lifestyle, appearances, and backstories.

Since Karino was depicted as a bachelor living alone and drew manga for a living, we estimated him to be above the legal age. Precisely, we approximated him to be about 25 years old.

Finally, since Tamaru was already married and had a child around the same age as Kotaro, we estimated him to be in his thirties at about 35 years old.