Reasoning: Zhang Ming said he was 22 and Yan Li said he was 23, which must be true or false; Zhang Ming said that he was 2 years younger than Wang Hong, and Yan Li said that Wang Hong was 3 years older than him, which must be true or false. So the rest of the words are true, that is, Zhang Ming is one year older than Li Yan.

Suppose Zhang Ming is 22 years old, Yan Li is 2 1 year old, and Wang Hong is 25 years old according to Yan Li. Wang Hong said that Yan Li is 25 years old, so he should be three years older than Yan Li, which is contradictory.

So Zhang Ming is 23, while Yan Li is 22 and Wang Hong is 25.