aged

centenarian, nonagenarian, octogenarian, septuagenarian, sexagenarian

oldish

adult, grown-up, mature, middle-aged

pensioned, retired, superannuated

matriarchal, patriarchal, venerable

anile, decrepit, doddering, senile, spavined, tottery

overage (also overaged)

aging (or ageing), mature

antiquated, archaic, archaistic, dated, fusty, geriatric, medieval (also mediaeval), moldy, Noachian, obsolete, outmoded, out-of-date, passé

old-fashioned, old-time, old-world, retro, vintage

durable, enduring, lasting, long-lived, permanent

ageless, hallowed, time-honored, timeless, time-tested, timeworn, traditional, tried, tried-and-true

classic, classical

prehistoric (also prehistorical), primeval, primordial