However I haven't see a clear successor in this PBSC for 2027 yet. Xi will be 74 by 2027 and definitely need to retire by then or he would be 79 at the end of next tenure.
Ok Ding Xuexiang might be an option to succeed Xi in 2027 but Ding will also be 65 by then. Also he is pretty much a technocrat, never served as a region governor. IMO he won't be the successor, but I might be wrong since Xi broke many norms.
In comparison, Deng took the role of leadership at the age of 74 but he never served as General Secretary himself. Hu Yaobang came GS at the age of 67, Zhao Ziyang at 68 and both of them created deep instability and then Tian'anmen happened.
Jiang Zemin took over the seat at 63, Hu at 60. Xi became General Secretary at the age of 59, youngest leader since Mao. I don't understand why Xi hasn't appointed a successor yet given his age.
Well, there is no obvious successor, and I think that's clearly by design. Xi is centralizing power and there's certainly positive efficiencies to that.
As for continuation/succession concerns, I assume you'd try to mitigate through a combination of the deep bench of experience and authority in the form of the Party Elders, and upcoming new dynamic talent.
Like the above Twitter thread shows, along with China's growth, younger officials have increasingly broad and advanced experiences and opportunities.
Li Qiang worked his way up through China's economic heartland in the Yangtze River Delta. He's interfaced with Alibaba up through Tesla.
Ma Xingrui held various prestigious and successful posts in academia, space, and defense. He has governing experience in Shenzhen, Guangdong, and now Xinjiang.
Zhang Guoqing worked his way up the corporate ranks at Norinco before holding office in Chongqing, Tianjin, and Liaoning.
I'd say their resumes all compare favorably with previous leaders.