Question:

My family is planning to take a trip to Hokkaido, and I want to know what the average height would be. I am 13, and currently 5'9.

Answer:

It depend on sample age.
Male: 171.7cm / 5'63 (age: 20-29)
Female: 157.9cm / 5'18 (age: 20-29)

About 13, Male: 157.4cm/5'16 , Female: 155.7cm/5'11.