1. adjective /əʊld,oʊld/
a) Of an object, concept, relationship, etc., having existed for a relatively long period of time.
an old abandoned building
b) Of a living being, having lived for most of the expected years.
an old friend
Syn: ancient, long in the tooth, aged, ageing, aging, elderly, of age, erstwhile, ex-, former, one-time, past, antiquated, obsolete
2. noun /əʊld,oʊld/
a) People who are old; old beings.
b) The older generation.
Wikipedia foundation.