What are the poems about "30th birthday"?

I have five tenths, but I am determined to learn. Standing at 30, not confused at 40. At fifty, you know your destiny; at sixty, you listen; at seventy, you follow your heart. Don't break the rules. Twenty weak crowns, thirty standing, forty confused. You know your destiny at the age of fifty, sixty, seventy and eighty. If you are weak, you will stand and sigh, if you are not confused, you will stand and sigh.

"Standing at Thirty" is selected from the second chapter of The Analects of Confucius, political chapter.

The main content of "Being a Politics" involves Confucius' thought of "ruling by virtue", the basic principles of how to seek and be an official in politics, the relationship between learning and thinking, the process of Confucius' own learning and cultivation, the review of new learning methods in the past, and the further elaboration of filial piety and other moral categories.