老大

old age / very / eldest child in a family / leader of a group / boss / captain of a boat / leader of a criminal gang

prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity / old (of people) / venerable (person) / experienced / of long standing / always / all the time / of the past / very / outdated / (of meat etc) tough

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

big brother

no longer a child (idiom)

uncle / grandpa / CL:位[wei4]

"Madam" (affectionate term for an elderly woman) / CL:位[wei4]

coxswain / steersman / boatswain (bo'sun)

old lady / Madam (polite address) / CL:位[wei4]

pretentious and vacuous person

if you are lazy in your prime, you'll be sorry in your old age

vain regrets of old age (idiom)

regarding oneself as number one in terms of leadership, seniority or status