You do not want to give the interviewer anything negative to remember you by, such as some great personal or career disappointment, even long ago, that you wish could have been avoided.
Nor do you wish to give any answer which may hint that your whole heart and soul will not be in your work.
BEST ANSWER: Indicate that you are a happy, fulfilled, optimistic person and that, in general, you wouldn’t change a thing.
Example: “It’s been a good life, rich in learning and experience, and the best it yet to come. Every experience in life is a lesson it its own way. I wouldn’t change a thing.”