people, usually the elderly, who bully or look down on others, because they think their old age gives them the right to do so
Definitions (粵典–words.hk)
語句
藉住自己老年人嘅身份，濫用喺一啲完全唔關事嘅地方，要其他人優待佢哋 to bully or look down on others and take advantage of one's own seniority; to hold a patronizing attitude because of old age
Definitions (Wiktionary)
phrase, Cantonese, derogatory, idiomatic
to rely on one's seniority or old age to look down on others or do things (syn.) 倚老卖老, 倚老賣老