I wonder why childhood memories are so much more powerful at evoking memories than ones from our young adulthood. I had nostalgia in my 20’s for events and places 10-20 years earlier. I now have a much longer reach into the past, 60 years of memory before the present date, but events 30 years ago don’t attract nearly as well. If I am nostalgic for adult events at all, it is usually for situations in which my children were young. Events without them might be recalled, and are often pleasant, but few of them grip.
Or rather, the nostalgia is different. I find it fun to revisit road rallies, some earlier small group Bible studies, some Dungeons and Dragons, but I don’t tear up over them. No Sehnsucht, no desire to find some old road that can take me back there. Cabbie, take me to my childhood. I don't mind the cost. Of courtship, it is the first few months that evoke those soft-edged, pink-cloud memories – yet they were not the best times.
Knowing that memory is inaccurate, and each remembering is not based on the original event, but on the last time we remembered, my guess is...
because they were remembered most often, they fit the overall narrative of our lives better. They have been smoothed over, defanged. They are nonthreatening - and less real.