Age of Empires 2 China has reached the age of emperors, why don't there be rockets?

In which era did China in Age of Empires 2 have rocket technology? In fact, in the Age of Empires 2,[Fire Arrow] wasn't a real skill or tactic. Although players could use rockets to attack enemies in the game, in reality, the rocket technique was a fictional technology that did not exist in the real world. In Age of Empires 2, each country had a different cultural and historical background, including some fictional skills and tactics. Therefore, some countries might have some specific skills or tactics in a specific era, but this did not mean that these skills or tactics really existed.