That's China, not Russia and while its almost indisputable that age falsification happened nobody was that young, more like 14. I think one even confessed to being underage a few years later.

Its worth noting the age limit for gymnastics was only raised to 16 in 2000 and many previous Olympic gymnasts competed while 14, including Nadia Comăneci who earned a perfect score (which was until then considered unobtainable, the scoreboards weren't equipped to even handle that score) at 14. Of course, at the time, the Chinese athletes were competing against other athletes that followed the age rules which, arguably, gave them an unfair advantage.

That's all irrelevant though because the whole subject is totally off topic.