Eldest
From BiblePortal Wikipedia
King James Dictionary [1]
Eld'Est, a. Oldest most advanced in age that was born before others as the eldest son or daughter. It seems to always applied to persons or at least to animals, and not to things. If ever applied to things, it must signify, that was first formed or produced, that has existed the longest time. But applied to things we use oldest.
Webster's Dictionary [2]
(1): ( a.) Born or living first, or before the others, as a son, daughter, brother, etc.; first in origin. See Elder.
(2): ( a.) Oldest; longest in duration.
