A big reason decades roll by so quickly when you get older is that you’ve seen it all before. Unlike when you were a kid, nothing seems that new or exciting any more. You fall into routines of work, kids, chores, and brief bits of rigorously scheduled recreation.
Without a stream of new experiences, a decade can quickly become an empty wasteland simply because there are no vivid memories to fill the space. The worst days of your life can seem so long because they are filled with one unexpected turn after another. Try to make your longest days the best ones instead: Do something new today.