老成持重　

◎ 老成持重 lǎochéng-chízhòng

[be experienced and prudent; be rich in years and sound of judgment] 阅历多,经验丰富,遇事沉着稳重

而老成持重,坐靡岁月,终于无成者,不可胜数。——清· 魏善伯《留侯论》