The Year of Being Earnest: 30 years old; The Year of Not Being Perplexed: 40 years old; The Year of Knowing Life: 50 years old; The Year of Flowering Armor: 60 years old; The Year of Ancient Rarity: 70 years old.

The Analects of Confucius - For the Governance of the State recorded that Zi said, "I am ten years old, but I am determined to learn; I am thirty years old, I am established; I am forty years old, but I am not perplexed; I am fifty years old, but I know the destiny of Heaven; I am sixty years old, but I am obedient to the ears; and I am seventy years old, but I do not exceed the limits of what I want to do."

Meaning: Confucius said, "At the age of fifteen I set my mind to study, at thirty I was able to stand on my own feet, at forty I was no longer confused when I encountered things, at fifty I knew what could not be dictated by human power and was happy to know the fate of heaven, at sixty I was able to listen to all kinds of different opinions, and at seventy I was able to do what I wished (to be at liberty to do as I wished) without going beyond the rules.

Ancient Rareness：

During the Ming Dynasty, the famous painter and calligrapher Tang Yin (唐寅) read Du Poetry, and then lamented that he had already lived past the age of "Ancient Rareness".

He wrote a poem called "Seventy Words": "Life is seventy years old and rare, but my seventy years are strange. The first two years young, after ten years of senility, only fifty years in the middle, half of the night again, counting only twenty-five years in the world, suffered a lot of how much running around trouble." Tang Yin, although living past the age of old, still sigh sigh life geometry.