Book of Psalms (Author Moses, David, Solomon, Asaph, Eman, Ethan, sons of Core, compiled by Esdras)
Chapter 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.