It may be just a "distortion" of perception of the past: several decades in the past are much more "succinct" to our present view than a month half a year ago;

It may be just a "distortion" of perception of the past: several decades in the past are much more "succinct" to our present view than a month half a year ago; we look at all the achievements in several decades before us at once, whereas it's an entire half of our own lifespan.