Definitions
1.noun(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."
2.noun(in combination) One of a specified age."when he was an eight-year-old ; a 62-year-old should"
3.nounA person older than oneself, especially an adult in relation to a teenager.
4.noun(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."
5.adjectiveOf an object, concept, relationship, etc., having existed for a relatively long period of time."an old abandoned building; an old friend"
6.adjectiveHaving been used and thus no longer new or unused."I find that an old toothbrush is good to clean the keyboard with."
7.adjectiveHaving 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."
8.adjective(heading) Of an earlier time.
9.adjectiveTiresome after prolonged repetition."Your constant pestering is getting old."
10.adjectiveSaid of subdued colors, particularly reds, pinks and oranges, as if they had faded over time.
11.adjectiveA grammatical intensifier, often used in describing something positive. (Mostly in idioms like good old, big old and little old, any old and some old.)"We're having a good old time. My next car will be a big old SUV. My wife makes the best little old apple pie in Texas."
12.adjectiveExcessive, abundant.