KJV Dictionary Definition: eld
ELD, n. Old age; decrepitude.
1. Old people; persons worn out with age.
This word is entirely obsolete. But its derivative elder is in use.
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.
ELD'ING, n. Fuel. Local.