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Definition of old : 1. Aged; antiquated; hence, wanting in the mental vigor or other qualities belonging to youth; - used disparagingly as a term of reproach.
2. Continued in life; advanced in the course of existence; having ( a certain) length of existence; - designating the age of a person or thing; as, an infant a few hours old; a cathedral centuries old.
3. Formerly existing; ancient; not modern; preceding; original; as, an old law; an old custom; an old promise.
4. Long cultivated; as, an old farm; old land, as opposed to new land, that is, to land lately cleared.
5. Long practiced; hence, skilled; experienced; cunning; as, an old offender; old in vice.
6. More than enough; abundant.
7. Not new or fresh; not recently made or produced; having existed for a long time; as, old wine; an old friendship.
8. Not young; advanced far in years or life; having lived till toward the end of the ordinary term of living; as, an old man; an old age; an old horse; an old tree.
9. Old- fashioned; wonted; customary; as of old; as, the good old times; hence, colloquially, gay; jolly.
10. Open country.
11. Used colloquially as a term of cordiality and familiarity.
12. Worn out; weakened or exhausted by use; past usefulness; as, old shoes; old clothes.

Synonyms:

sure-enough, dead, early, late, white-haired, old folk, immemorial, grey, grizzled, advanced, leaden, senescent, dry, familiar, (out) in the open, tiring, dated, inactive, public, transparent, whilom, perdurable, honey, worn, useless, honest-to-god, timeworn, obsolete, outmoded, anemic, aging, traditional, perennial, in the public domain, open, decayed, yellowed, ancestor, tattered, dowdy, agglutinative, middle-aged, overaged, numbing, unoriginal, arid, ragged, fresh, bud, contemporary, continue, pass, senior, quondam, impaired, antiquity, tame, Methuselah, lasting, broken-down, experienced, heavy, secondhand, age, continuing, dilapidated, purposeless, ability, sometime, sister, stupid, drab, ineffective, long-ago, oldster, modern, jading, longtime, age gap, anile, excellent, the elderly, dreary, gray-haired, babe, grown, persistent, classical, sr., pensioner, uninteresting, the aged, doddery, sexagenarian, elder, long-standing, grey-haired, dateless, patched, torn, new, ponderous, stale, long-lasting, adult, peer, over-the-hill, ancestral, preceding, dear, great, worthless, permanent, stodgy, creole, prehistoric, disused, drudging, other, monochromatic, pardner, known, gaga, idiomatic, flat, nonagenarian, unyoung, hand-me-down, ageing, faulty, wearisome, genuine, gray, one-time, centenarian, time-honored, baby, exhausted, extinct, monotonous, timeless, deficient, recent, dull, obsolescent, at, overage, onetime, weary, tedious, ho-hum, tired, used, mended, age bracket, disyllabic, hoar, oldish, shattered, precede, yellow, distant, seasoned, retired, inefficient, figurative, hoary, sunset, wearying, moth-eaten, outdated, echt, auld, hand-down, bro, young, out of date, of age, pathetic, doddering, abiding, fusty, worn-out, enduring, senile, age-old, humdrum, versed, olden, medieval, decaying, shabby, pristine, rare, colorless, gray-headed, magnificent, my man, darkened, grey-headed, practiced, old-fashioned, jejune, the old, pedestrian, mate, remote, slow, weather-beaten, defective, emeritus, veteran, figuratively, beloved, cognate, cold, dusty, superb, once, good, out, tiresome, under, faded, honest-to-goodness, unclassified, erstwhile, long-lived, rusty, forgotten, stuffy, older, overt, unwritten, sugar, infirm, mind-numbing, pointless, thin, futile

geriatric, venerable, aged, mature, matured, durable, vintage, elderly, superannuated, octogenarian, ripe, ancient

former, past, ago, yore, old-time, bygone, anteceding, yesterday's, historical, previous

primeval, archaic, primitive, primordial, antique, paleolithic, antiquated, antediluvian

Usage examples:

• Old Bill's like that. - "My Man Jeeves", P. G. Wodehouse.
• I wonder if they will have a lot of old men. - "Red Hair", Elinor Glyn.
• Never you mind, old boy! - "Maggie: A Girl of the Streets", Stephen Crane.