Synonyms For "Old" :

1 syllable:

aged, auld, gray, great, grey, hoar, keen, neat, past, patched, stale, swell, used, worn

2 syllables:

ageing, aging, ancient, anile, antique, bully, corking, cracking, dandy, darkened, erstwhile, former, gaga, grizzly, groovy, hoary, longtime, mature, nifty, not bad, of age, older, oldish, onetime, peachy, quondam, rusty, senile, senior, smashing, sometime, sunset, yellow, yellowed

3 syllables:

archaic, doddering, doddery, elderly, experient, familiar, noncurrent, nonmodern, overage, overaged, previous, secondhand, senescent

4 syllables:

antiquated, emeritus, experienced, venerable

5 syllables:

centenarian, immemorial

6 syllables:

antediluvian, nonagenarian, octogenarian, sexagenarian, superannuated