Ancient times; antiquity; days of yore.
Origin of eld
From Middle English elde, from Old English ieldu, eldo, ieldo (“age, period of time; period; time of life, years; mature or old age, eld; an age of the world, era, epoch”), from Proto-Germanic *aldį̄ (“eld, age”), from Proto-Germanic *aldaz (“grown up, mature, old”), from Proto-Germanic *alaną (“to grow, breed, nourish”), from Proto-Indo-European *al- (“to raise, feed”). Cognate with Scots eild (“age”), North Frisian jelde (“age”), German Älte (“age”), Danish ælde (“eld, age”), Icelandic elli (“eld, age”). Related also to Gothic (alds, “generation, age”), Old English alan (“to grow up, nourish”). More at old.