Gilbert and colleagues measured the preferences, values, and personalities of more than nineteen thousand adults ages eighteen to sixty-eight. Some were asked to predict how much they would change over the next decade, others to reflect about how much they had changed in the previous one. Predictors expected that they would change very little in the next decade, while reflectors reported having changed a lot in the previous one. Qualities that feel immutable changes immensely. Core values — pleasure, security, success, and honesty — transformed. Preferences for vacations, music, hobbies, and even friend were transfigured. Hilariously, predictors were willing to pay an average of $129 a ticket for a show ten years away by their current favorite band, while reflectors would only pay $80 to see a show today by their favorite band from ten years ago.