It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that he (peace and blessings be upon him) said: "The son of Adam grows old, but two things of his remain: 1. greed, 2. hope."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6506