While I am fortunate enough to genuinely enjoy my job (I'm a librarian), I've been working since I was 14 years old. At work, I manage a large department, budgets and a staff that is expanding as other departments are folded into my department. I spend a lot of time talking with the people in the department about their goals, their work lives, and their private lives. One thing I've learned is that the higher up you go, the more time you spend listening to people and getting less of your own work done. Learning to delegate is a good thing.
After spending large portions of my day talking/listening, when I get home, I want to relax. I find I have less inclination to spend what free time I have cleaning the house and doing chores. Even shopping has become a royal pain. So although retirement has been an abstract concept up to this point (it was SO far in the future), I think it's time to really formulate a retirement plan.