Ali bin Rabi'ah said: I came to Sayyiduna Ali (may Allah be pleased with him) and said: "I am more suitable than my uncle; perhaps you would put me in his place." He said: "O my nephew, the opinion of an old man is better than the presence of a youth."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20333