老大
old age; very; eldest child in a family; leader of a group; boss; captain of a boat; leader of a criminal gang
老大娘
old lady; Madam (polite address); CL:位[wei4]
老大妈
'Madam' (affectionate term for an elderly woman); CL:位[wei4]
老大徒伤悲
vain regrets of old age (idiom)
老大爷
uncle; grandpa; CL:位[wei4]
以老大自居
regarding oneself as number one in terms of leadership, seniority or status
少壮不努力,老大徒伤悲
if you are lazy in your prime, you'll be sorry in your old age