IMHO, retirement is like life in general. You get out of it what you put into it. Having retired several times, it became clear that retirement was just another phase in that quest for happiness - seeking some degree of physical comfort, something to do that you enjoy, people to befriend/love and things to look forward to. The challenge can become on of finding/being with people who share your interests, affording the things you need, want or want to do and maintaining your health. It is like having another job where the work is different and, hopefully, more interesting and enjoyable.