Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

antiquity. maturity; decline, decay; senility &c 128. seniority, eldership, primogeniture. archaism &c (the past) 122; thing of the past, relic of the past; megatherium†; Sanskrit. tradition, prescription, custom, immemorial usage, common law. V. be old &c adj.; have had its day, have seen its day; become old &c adj.; age, fade, senesce. Adj. old, ancient, antique; of long standing, time-honored, venerable; elder, eldest; firstborn. prime; primitive, primeval, primigenous†; paleolontological, paleontologic, paleoanthropological, paleoanthropic†, paleolithic, primordial, primordinate†; aboriginal &c (beginning) 66; diluvian†, antediluvian; protohistoric†; prehistoric; antebellum, colonial, precolumbian; patriarchal, preadamite†; paleocrystic†; fossil, paleozoolical, paleozoic, preglacial†, antemundane†; archaic, classic, medieval, Pre-Raphaelite, ancestral, black-letter. immemorial, traditional, prescriptive, customary, whereof the memory of man runneth not to the contrary; inveterate, rooted. antiquated, of other times, rococo, of the old school, after-age, obsolete; out of date, out of fashion, out of it; stale, old-fashioned, behind the age; old-world; exploded; gone out, gone by; passe, run out; senile &c 128; time worn; crumbling &c (deteriorated) 659; secondhand. old as the hills, old as Methuselah, old as Adam†, old as history. [geological eras (list, starting at given number of years bp)] Archeozoic [5,000,000,000], Proterozoic [1,500,000,000], Paleozoic [600,000,000], Mesozoic [220,000,000], Cenozoic [70,000,000]. [geological periods] Precambrian, Cambrian [600,000,000], Ordovician [500,000,000], Silurian [440,000,000], Devonian [400,000,000], Mississippian [350,000,000], Pennsylvanian [300,000,000], Permian [270,000,000], Triassic [220,000,000], Jurassic [180,000,000], Cretaceous [135,000,000], Tertiary [70,000,000], Paleogene [70,000,000], Neocene [25,0000,000], Quaternary [1,000,000]. [geological epochs (list, starting at 70,000,000 years bp)] Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Recent. Adv. since the world was made, since the year one, since the days of Methuselah. Phr. vetera extollimus recentium incuriosi [Lat.] [Tacitus].