Musannaf Ibn Abi Shayba 33:364

Ibn Mahdi narrated to us, from Sufyan, from Ziyad ibn Fayyad, from Abu Hazim, who said: Umm al-Darda’ said: "The old man comes and prays, and the young man comes and does not pray." Abu al-Darda’ said: "Each is in a reward that has been prepared for him."