adjective
older; -est
having lived for many years :not young
b - used to talk about or ask about a person's age
having a specified age
having existed or been in use for a long time :not new
having existed for a specified amount of time
always used before a noun
belonging to, used by, or known by someone in the past
b - used to say that someone or something has been your friend, enemy, etc., for a long time
always used before a noun :done or experienced many times
informal - used for emphasis after adjectives like big, good, etc.
any old
informal - used to describe someone or something that is not special or specific
chip off the old block
for old times' sake
old boy/chap/man/etc.
Brit old-fashioned - used to address a man
noun
plural olds
[count] :a person who has a specified age - used in combination
old [plural] :old people
of old
formal + literary :in the past :in a time that was long ago