Due to overall better diet and nutrition, China and South Korea have the biggest gain in height. The Asians are short stereotype is just false today.

From this article: https://www.bbc.com/news/health-54828544

The average height for 19 years boys

China: 175.7 CM (5 feet 9.2 inches) vs USA 176.7 CM (5 feet 9.57 inches) - 19 years Chinese boys are slightly short (.4 inches different or side of an index fingernail)

For 19 years boys in India - 166.5 CM or 5 feet 5.6 inches

The average height for 19 years girls

China 163.5 CM (5 feet 4.4 inches) vs. USA (5 feet 4.3 inches) - 19 years Chinese girls are a little taller than USA 19 years girls.

For 19 years girls in India - 155.2 CM or 5 feet 1.1 inches

Basically, they are the same now in 2019 for China vs. USA height-wise for 19 years old.

https://archive.md/1chdI