Many people would consider a phased retirement as opposed to quitting cold-turkey. There are a number of reasons why this can be a good option- both from a financial perspective as well as from having something to fill your time and keeping the social aspect alive.
This CNBC article provides four ways to prepare for a phased transition. What is missing in the article, however, is that you need to have a Plan B if your company does not offer this type of arrangement- some do and many do not.
Also take some time to research other options you may consider doing- create your own phased transition if you can afford to.