倚老卖老

yǐ lǎo mài lǎo

(idiom) to flaunt one's seniority; to rely on one's age or length of experience to control or belittle others

to lean on

lǎo

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

mài

to sell

lǎo

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