Do not say that the earlier days were better than these, because this is not a quest that comes from wisdom (Ecclesiastes 7:10).
I have been in the practice of relaxing myself each day with self-hypnosis, which allows me to go back in time and relive some very pleasant childhood experiences.
One time, I was relaxing (after having just emerged from the whirlpool treatment in a spa), and I used the opportunity to go back in time to enjoy a fun-filled day in a summer camp, some forty years earlier. Only later did it occur to me that at the spa I was also having a wonderful time! Why could I not enjoy this present moment? Why did I have to go back in time to an experience of the past?
The reason, I think, is because that enjoyable day at camp had closure; it had ended having indeed been a great day. While the spa was equally pleasant, there was still an uncertainty as to whether this spirit would be maintained. At any moment, there might have been a call from the office with some disturbing news. The subconscious expectation that something upsetting might happen did not (and still does not) allow me to fully enjoy the present.
King Solomon says that it is not wise to reflect upon the past as idyllic. Why? When circumstances are favorable, wisdom allows us to actually enjoy the present. As the Psalmist says, He will not fear bad tidings, his heart being firm in trust in God (Psalms 112:7). There is no reason to have an attitude of foreboding. While it is foolish to build castles in the sky, it is equally foolish to build dungeons in the cellar.