I know a number of attorneys and physicians in their 70s and 80s who could retire and choose to keep working. They enjoy their work, they are good at it, they make money (not always a lot, but enough for them), and they say, "what else would I do?" Most of them are working less than full-time, but many of them still work 4-5 days a week. I've asked a few of them if they plan to retire, and they have told me, flat out, no. Another "younger" attorney and I have marveled at this and told each other, "if I tell you I still want to be working when we're 60, slap me." But these people really identify with their profession and find meaning in their work. They also travel, read, have children and hobbies and other interests, but their work is what gets them up and going in the morning. They are happy.