>>3830296>>3830297He is very likely not >18 years old. Most likely 13-14.
The official site lists him as 161cm in height.
First you need to understand what a percentile is:
>A percentile indicates the relative standing of a value within a data set, describing the percentage of data points below that value. For example, if a student scores in the 3rd percentile on a test, it means they scored higher than 3% of the participants and lower than the remaining 97%. The 50th percentile is the value below which 50% of the data falls. If someone is in the 97th percentile, they scored higher than 97% of the participants, with only 3% scoring higher.We will assume >3% for his cutoff. If he was below, he would be a manlet (or catlet) and he is certainly not that because his proportions are natural. A manlet would have weird head to body ratio.
Let's start with the WHO data, just for fun:
This shows that the 3 percentile cutoff is 17 years old. So he can be at max 17 year old.
The most likely fit, the 50 percentile, if he is of average height for his age, is about 13.5 yo.
Now lets look at Koreans:
It's hard to read but the 3 percentile is also a bit less than 17 years.
The best fit, 50 percentile, is is between 12.5 and 13.5 yo.
Let's check Hong Kong:
3 percentile is 159cm at 18yo so he could be 18yo in Hong Kong. Best fit is 14yo.
Now Taiwan is probably also a good source:
3rd percentile is almost 18yo but not quite.
Best fit is almost 14 yo.
Now China but reading the chart is not easy and we don't know how recent the data is.
I entered 01/01/2010 for birth and measurement date 01/01/2023, so he is 13yo: Percentile 57.5
For 14yo: Percentile 24.9
For 17yo: Percentile 3.2
For 18yo: Percentile 2.7
Sauces:
https://pastebin.com/ZPmxMNBY 
