Abdullah bin al-Hakam bin Abi Ziyad narrated that Zayd bin al-Khattab (may Allah be pleased with him) was older than Umar (may Allah be pleased with him); his kunyah was Abu Abd al-Rahman, and he was also called Abu Thawr.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4627