Almost every member of congress has investments they acquired by getting into office. They are immune to insider trading laws. Not to mention, all the gifts and special meals they get from lobbyists. They cling to their positions because they have material interests to stay in power. If they turn over their office to a younger politician, they lose a lot of money and free shit.

It's not a coincidence most members of congress are multimillionaires. They aren't interested in serving the public. They're interested in living lavish lifestyles.