China High-tech Cities Shenzhen— Becoming An International Hub of Hardware Innovation The youngest city in China: The average age of its With 7,860,000 migrants in 2016, Shenzhen is also one population in 2016 is only 33. of the most diverse cities in the country. Shenzhen is a city with culture of tolerance and open-mindedness. It was voted China’s Most Dynamic City and the City Most Favored by Migrant Workers in 2014.