always do things by the book; inflexible to changes or new ways of doing things

employee who worked under three transitions of management / minister who served three transitions of emperor in China's history

middle-aged and elderly people

Argyle Street, a street in Kowloon, Hong Kong

old and penniless [colloquial]

Literally: Elder human is wise, elder ghost is powerful – The grown up / seniors are wiser as they have lots of experienced and have gone through numerous challenges in lives which made them wiser.

The grown up / seniors might have thought things thoroughly because they have experienced lots in their lives

hello; how are you? (old slang)

one's child(ren) and wife are still young

your old man; your father [colloquial]

your old mother (derogatory); ' fuck your mother', foul language insulting one's mother when cursing someone [colloquial]

your mother can't take a good fucking, an expression used to insult one's mother when cursing someone [colloquial]

'your old mother's asshole', foul language insulting one's mother when cursing someone [colloquial]

you lout [colloquial]

your father; your old man [colloquial]

your boss [written and colloquial]; euphemism for '你老母', 'fuck your mother'. foul language insulting one's mother when cursing someone [colloquial]

his mother

one who has more experience or seniority look down on juniors with arrogance

a newly-wed man / being conned or cheated

elder statesman

one's parents; one's father and mother [written and colloquial]

toothless tiger, something / someone that seems to be powerful and scary yet cannot bite / strike, the government practicing a law

(adjective) Outdated

very old; ancient

when old-fashioned becomes trendy again

an idiom to describe a person, who is very stubborn, very fixed in his or her own way to doing things and hardly listens to anyone else

live off one's past success

so old

a middleman who acts as a mediator or negotiator to try and resolve the issue(s) of others

to be a ponce; to be a man who lives off a woman [colloquial]