old.

Of an object, concept, relationship, etc., having existed for a relatively long period of time.

an old abandoned building

an old friend

Of an object, concept, relationship, etc., having existed for a relatively long period of time. Of a living being, having lived for most of the expected years.

a wrinkled old man

Of an object, concept, relationship, etc., having existed for a relatively long period of time. Of a perishable item, having existed for most of, or more than, its shelf life.

an old loaf of bread

Of an object, concept, relationship, etc., having existed for a relatively long period of time. Of a species or language, belonging to a lineage that is distantly related to others.

the ginkgo is one of the oldest living trees

Basque is the oldest language in Europe

Having been used and thus no longer new or unused.

I find that an old toothbrush is good to clean the keyboard with.

Having existed or lived for the specified time.

How old are they? She’s five years old and he's seven. We also have a young teen and a two-year-old child.

My great-grandfather lived to be a hundred and one years old.

Of an earlier time. Former, previous.

My new car is not as good as my old one.  a school reunion for Old Etonians

Of an earlier time. That is no longer in existence.

The footpath follows the route of an old railway line.

Of an earlier time. Obsolete; out-of-date.

That is the old way of doing things; now we do it this way.

Of an earlier time. Familiar.

When he got drunk and quarrelsome they just gave him the old heave-ho.

She always makes the same old excuses.

Of an earlier time. Being a graduate or alumnus of a school, especially a public school.

Tiresome after prolonged repetition.

Your constant pestering is getting old.

Said of subdued colors, particularly reds, pinks and oranges, as if they had faded over time.

A grammatical intensifier, often used in describing something positive, and combined with another adjective.

We're having a good old time.

My next car will be a big old SUV.

Indicating affection and familiarity.

Designed for a mature audience; unsuitable for children below a certain age.

Excessive, abundant.

People who are old; old beings; the older generation, taken as a group.

A civilised society should always look after the old in the community.

A person older than oneself, especially an adult in relation to a teenager.

I'm not letting an old wreck my good time today.

I'm not letting any olds wreck my good time today.

One's parents.

I had to sneak out to meet my girlfriend and tell the olds I was going to the library.

A typically dark-coloured lager brewed by the traditional top-fermentation method.