There have been a lot of cases where senior citizens get depressed after retiring. Sure some are able to cope by doing some hobbies, but a lot are having difficulty adjusting to life of not doing anything. What might seem like a utopia while working, turns into boredom when they experience it. They realize that there is a lot of time in a day, and you can only do a hobby for so much time everyday.
I don't know what purpose people will find in a fully automated world, but I do hope we think of one soon.
After retirement, men often suicide. They lose their connections to the world - lose purpose. Years of having something to do each day, turned into having nothing to do that matters.