The Liao were a regime established by the Khitans. The founder of the Liao state, Yelü Abaoji, was a tribal chief whose ancestors were Khitan tribesmen. In 907, Yelü Abaoji unified the Khitan tribes and gradually became more powerful. In 916, the stable Yelü Abaoji established the Great Khitan State, which was renamed Daliao in 947, then restored to the Great Khitan in 983, and changed to Daliao in 1066. It was destroyed by Jin in 1125. From 916 to 1125, the Liao state lasted 210 years and produced 9 emperors. The specific age and status are as follows:
Liao Taizu Yelü Abaoji died at the age of 55 and reigned for 11 years.
Emperor Taizong of Liao, yelü Deguang, died at the age of 46 and reigned for 21 years.
Emperor Yelü Nguyen of Liao, died at the age of 34 and reigned for 5 years.
Liao Muzong Yelü Jing, died at the age of 39 and reigned for 19 years.
Emperor Jingzong of Liaojing died at the age of 35 and reigned for 14 years.
Liao Shengzong Yelü Longxu died at the age of 61 and reigned for 50 years.
Emperor Yelü Zongzhen of Liaoxing died at the age of 40 and reigned for 25 years.
Liao Daozong Yelü Hongji died at the age of 70 and reigned for 47 years.
Emperor Yelü Yanxi, emperor of Tianzuo, died at the age of 54 and reigned for 25 years.
The 9 emperors of the Liao Dynasty had an average age of 48.2 years. This average is higher than any previous dynasty with more than 3 emperors. It is exactly 1 year older than the Tang Dynasty (the average age of Tang emperors is 47.2 years). The Tang Dynasty produced many emperors, which are more comparable to those of the two Song Dynasties. The three regimes all produced 9 emperors, the average age of the nine emperors of the Northern Song Dynasty was 48 years old, and the average age of the Southern Song Dynasty, except for Zhao Xian's unknown birth year, was 46.9, all lower than the Liao.
Why is the average age of the emperors produced by the Liao, an ethnic minority regime, relatively high? There are many factors that affect the age of the emperor, but the first thing that comes to my mind is that the emperors of the Liao regime were ethnic minorities, and the emperors of the Central Plains had more opportunities to exercise than the emperors of the Central Plains. But that's just my instincts, there's no definitive evidence to prove it.
Emperors of the Liao Dynasty also reigned for a long time, with an average reign of 24.1 years. It is also longer than any previous dynasty with more than 3 emperors. Liao Shengzong Yelü Longxu lived for 61 years, took the throne at the age of twelve, and reigned for 50 years. He was the eldest son of Emperor Jingzong of Liao, the former King of Liang. When he ascended the throne, he was young, and the government was controlled by his mother, Empress Xiao, who was regent for 27 years.
The longest-lived emperor of the Liao Dynasty was Emperor Daozong Yelü Hongji, who died at the age of 70. Seventy years of life is rare, and he has lived to be seventy years old. He lived longer than his grandfather, but ascended the throne later than Yerushalayim, reigned at the age of twenty-four, reigned for 47 years, and reigned a little shorter than his grandfather.