“Fastidious” should remind you of a person who is very “fast” in cleaning any dirt in her room. She cleans the room very fast, every nook and cranny, to the last detail!
“Poseur” is someone who strikes a pose to impress others. In reality, he/she is very different from what he/she is trying to project.
“Gerontocracy” should remind us of our great grandfathers who, as was the norm, liked to dictate the way how their successive generations should lead their lives.