1.
harm caused by elderly people clinging to power or authority
The negative effects on an organization or society when elderly people in positions of power refuse to step down and block progress or younger talent. Originally a sociopolitical term about gerontocracy in institutions.
2.
troublesome or inconsiderate elderly person
A derogatory slang term used to describe an elderly person who behaves rudely, selfishly, or unreasonably. This usage has spread online and in colloquial speech.
Usage
Sense 1 (systemic/organizational) was the original meaning and is used in serious discussions about politics, business, and institutions. Sense 2 (derogatory label for individuals) has become widespread on social media and in informal speech, particularly among younger generations.
Watch out
This is a highly negative and potentially offensive term, especially in sense 2. Using it to describe a specific person is considered very rude. It is best understood for comprehension rather than active use in polite company.