Old

(with the, invariable plural only) 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."

(in combination) One of a specified age.

"when he was an eight-year-old ; a 62-year-old should"

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

(most often plural) One's parents.

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

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

"an old abandoned building;  an old friend"

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."

(heading) Of an earlier time.