Chenghua Emperor Zhu Jianshen and Ning Prince Zhu Chenhao are cousins, both are fifth-generation descendants of Ming Taizu Zhu Yuanzhang. Zhu Chenhao's ancestor was Zhu Quan, King of Ning, who was the seventeenth son of Zhu Yuanzhang, while Zhu Jianshen was a descendant of Zhu Di, the fourth son of Zhu Yuanzhang.
There was a rule for royal naming in the Ming Dynasty, which was surname + five elements. Zhu Jianshen and Zhu Chenhao both have three points of water in their names, so they are from the same generation.
Zhu Houzhao is the grandson of Zhu Jianshen and the only son of Emperor Hongzhi Zhu Youtang, who is Ming Wuzong. Therefore, according to seniority, Zhu Chenhao is Zhu Houzhao's great-uncle, two generations older than Zhu Houzhao. But although they are uncles, Zhu Chenhao was born in 1476 and Zhu Houzhao was born in 1491. There is only a 15-year age difference between them. Even in ancient times, the age gap was only one generation.
In 1519 AD, Zhu Chenhao, who was 44 years old at the time, rebelled. The emperor was Zhu Houzhao, Emperor Wuzong of the Ming Dynasty. In this year, Zhu Houzhao, the Emperor Wuzong of the Ming Dynasty, was 29 years old.