公元前我们都太年轻世纪末我们都太苍老
[gōng yuán qián wŏ men dōu tài nián qīng shì jì mò wŏ men dōu tài cāng lăo]
Before the Common Era we were too young, and by the end of the century we are too old. It reflects a retrospective thought on life stages and how quickly times have changed or people have aged over history.