The power of the office, the constant ass kissing, the perks, the people fawning over them when they appear, the body guards all of these things make politicians feel like tin gods. They adore the office so much they want to keep it till death.
Most Americans as they age look forward to relief from the daily routines of getting up early and going off to work. Their bodies and minds age and they want to slow down and enjoy what they have worked for in a lifetime. Retirement , their home paid for, their family, perhaps travel. People like McConnell, Feinstein, Pelosi, Hoyer, they have had free trips paid for by the taxpayer, they have an office they come to at whatever time they feel like , a staff to do their bidding, Food and barber shops right there at work, the works is easy and so are the riches. All they have to do is stick their hand up when the party tells them too.