Someone who is old has lived for many years and is no longer young.

You use old to talk about how many days, weeks, months, or years someone or something has lived or existed.

Something that is old has existed for a long time.

Something that is old is no longer in good condition because of its age or because it has been used a lot.

You use old to refer to something that is no longer used, that no longer exists, or that has been replaced by something else.

You use old to refer to something that used to belong to you, or to a person or thing that used to have a particular role in your life.

An old friend, enemy, or rival is someone who has been your friend, enemy, or rival for a long time.

You can use old to express affection when talking to or about someone you know.

You use any old to emphasize that the quality or type of something is not important. If you say that a particular thing is not any old thing, you are emphasizing how special or famous it is.

In the old days means in the past, before things changed.

When people refer to the good old days, they are referring to a time in the past when they think that life was better than it is now.

If you talk about people or things of old, you are referring to people or things that existed long ago but which no longer exist, or no longer exist in the same form.