不惑之年

Explanation: Perplexed: what can discern no doubt encountered. 40 years as a representative said. 　　Usage: Partial official; as subject, attribute; describe the people to four-year-old common sense and not confusing to discern 　　Source: Pre-Qin Confucian "Analects": "Forty had no doubts." 　　Examples: He graduated from college only 20, but time flies forward, almost ~ out soon. Thesaurus:  Into middle age Antonym Group:  bud, maiden years; teenage of girls; budding beauty, Jin Senianhua, xanthic flowers youngster, millennium