eldest
‘of persons or things: Most aged, farthest advanced in age’
Lexical development traced from the Tamil root:
E. eldeste, eldust, heldast, heldest < O.E. (Merc.) eldrost ‘most advanced in age, that was born first’ < eald, ald ‘old’ < Proto-G. althaz ‘grown up, adult’ < el < al- < Tamil al