I know it sounds counter-intuitive, but sometimes too much of a good thing makes the good thing not as good anymore. You've heard of the phenomenon, a lottery winner is much happier right after they win the lottery, but a couple of years later, they become used to their newfound riches and return to whatever level of happiness they enjoyed before winning the lottery.
In retirement, instead of winning money, you win time. I admit I've grown accustomed to all the extra time I have in retirement. At first it was such a novelty. But over the past couple of years, I've started to take my good fortune for granted. Nothing like a little elective scarcity (a part-time job) to remind you to appreciate the luxury of time. I tackled the topic of Hedonic Adaptation in my U.S. News post yesterday.
This is a post from Retirement: A Full-Time Job