Similar experiences, yet a different count of significant events.
In 1963, I hiked for 7 days with a group of scouts, along the Appalachian Trail (AT), from the Delaware Water Gap, over the high balds of northern New Jersey, to High Point State Park. To this day, I can recall nearly hour by hour (sometimes minute by minute) that entire trip in cinematic detail. Thirty-five years later, I hiked for 10 days with my eldest brother, along the AT from near Irwin, Tennessee to Damascus, Virginia. The trail there passes through terrain dramatically different from that of northern New Jersey. Although I do have some wonderfully clear recollections of it directly from the experience, I can recall it now mostly from the photos that the two of us captured, and the trail log that I updated once or twice a day. On both hikes, I came across a rattlesnake in the middle of the trail. Only one was the first rattler that I had ever seen. Between those two hikes, I had enjoyed numerous AT hikes, each on a different section of the trail.
My internal measure of the passage of time depends on the ticks of significant (read, "new") events that I experience. That first AT hike provided a bounty of numerous ticks per hour--a count rate that diminished with each subsequent hike in new areas. The older I become, the lower the count of events that rank as significant. Instead of thousands or hundreds or tens of new experiences per day, the count sometimes sags to one new experience per month or two. So the clocks and the calendars become discordant with my sense of the passage of time.