Book of Psalms (Author Moses, David, Solomon, Asaph, Eman, Ethan, sons of Core, compiled by Esdras)
71:18insuper et usque ad senectutem et canos Deus ne derelinquas me donec adnuntiem brachium tuum generationi cunctisque qui venturi sunt fortitudines tuas
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.