Musnad Ahmad 30:2271

Qutaybah narrated to us, he said: Ya'qub narrated to us, from Abu Hazim, from Sa'id ibn Abi Sa'id al-Maqburi, from Abu Hurairah, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever Allah gives a lifespan of sixty years, then Allah has excused him regarding his age."