- 老大爷 lǎodàye grandpaA respectful way to address or refer to an older man, especially one you do not know; uncle; grandpa.
- 老大哥 lǎodàgē elder brothera respectful form of address for a man of one's own generation who is older than oneself; also used to refer to an experienced or leading member of a group
- 老大难 lǎodànán long-standing and difficult(of a problem or task) serious, complex, and difficult to resolve for a long period of time
- 老大娘 lǎodàniáng grannyA polite or respectful form of address for an elderly woman, typically a stranger; auntie; madam
- 龙头老大 lóngtóulǎodà big bossthe head or leader of a group or gang
- 老大不小 lǎodàbùxiǎo no longer a child(idiom) to have grown up; to be of age; no longer being a young child
- 船老大 chuánlǎodà boatswainThe chief crewman or helmsman of a small wooden boat; also used generally for a boatman or person in charge of a vessel.
- 老大徒伤悲 lǎodàtúshāngbēi to regret in old ageTo regret in old age the time wasted when one was young; refers to the uselessness of feeling sorry about one's laziness or missed opportunities later in life. This is the second half of the couplet [[少壮不努力,老大徒伤悲|少壯不努力,老大徒傷悲|shao4 zhuang4 bu4 nu3 li4 lao3 da4 tu2 shang1 bei1]]
- 老大妈 lǎodàmā auntiePolite and affectionate way to address an elderly woman, similar to "auntie", "granny", or "madam".
- 老大无成 lǎodàwúchéng to achieve nothing in old ageTo reach an old age without having accomplished anything or established a career.
- 以老大自居 yǐlǎodàzìjū to regard oneself as number oneto pride oneself on one's seniority; to act as if one is the leader or of the highest status
- 少壮不努力,老大徒伤悲 shàozhuàngbùnǔlìlǎodàtúshāngbēi if you are lazy in your youth, you will regret it in your old ageA proverb meaning that if one does not work hard while young and strong, one will only have useless regrets when old; from the Han dynasty poem [[长歌行|長歌行|chang2 ge1 xing2]]
- 铁老大 tiělǎodà China RailwayA playful or mocking nickname for China's railway authorities, originally used to describe their former monopoly and perceived bossy or arrogant image.
- 老大姐 lǎodàjiě elder sisterA respectful form of address for an older woman of one's own generation.