How old was Xiang Yu when he joined the army?

Xiang Yu (232- 202 BC) was born in Xiaxiang (now southwest of Suqian, Jiangsu). Chu descended from the door. After Chu's death, he went into exile with his uncle Xiang Liang in Wuzhong (now Suzhou, Jiangsu). When I was young, I couldn't learn calligraphy, but I still couldn't learn sword. Determined to learn "the enemy of ten thousand people" (that is, the ability to resist ten thousand people), I learned the art of war from my uncle. But I just have a "little knowledge" and refuse to study. "Xiang Yu is eight feet tall and can lift the tripod. When he was young, he was ambitious. When Qin Shihuang visited Zhejiang (now Qiantang River), Xiang Yu saw his horses and chariots commanding, and blurted out, "You can replace them. "In the first year of Qin Ershi (2009), Chen Sheng and Guangwu raised their arms in osawa Township. Xiang Yu responded with Xiang Liang in Wuzhong. Twenty-four-year-old Xiang Yu was promoted by the wind and rain of the people's uprising.