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oldest
vetustissima

my oldest friend
vetus amicus meus

the first and oldest
ecclesiae scribe romanus

nijmegen is the oldest city in the netherlands.
ulpia noviomagus batavorum antiquissima urbs nederlandiae est.

primogenitus, primogenita, primogenitum first-born; oldest (child);
primogenita

primogenitum, primogeniti birth-right, right of the first-born/oldest (child);
primogeniti

maximus, maxima, maximum greatest/biggest/largest; longest; oldest; highest, utmost; leading, chief;
maxima