The average age is around 20 and I doubt they are training to the most competitive levels in just a year or two.

> China's most famous e-sports player, Jian Zihao, has officially retired from gaming aged 23, citing ill-health.

> He had been a professional gamer since 2012, playing League of Legends under the name of "Uzi".

https://www.bbc.com/news/technology-52920786

He would have been ~15 in 2012.