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Hearing also depends on ear geometry a lot too.

When i face the source and push the flaps of my ears forward such that they are perpendicular to my head, I think i gain about 3-4dbs of treble gain.

Furtermore, if i cup my entire hand behind my ear, the gain goes up another 2-3 dbs. 

As I near 70, having been an avid music listener for 60 years and player off and on for 20 in my youth, I've lost hearing sensitivity for frequencies above 17khz. I can easily hear cymbal sizzle, but can't tell you what I'm missing in the range "above" my range. What's obvious is that gear with specs above the 20khz range probably isn't adding much to my experience, no matter what technical wizardry produces that capability (although my dogs may love it). If you are unsure about your hearing's frequency sensitivity, there are lots of frequency sweep tests available online or via your favorite streaming services (Spotify, Tidal, YouTube, etc.). When you stop hearing the tone, top or bottom, you know whether your ears are keeping up with your gear/speakers/music sources, at least in this context.  Worth knowing - as others in the thread have noted, we don't all hear the same way.

What i wouldnt give to be able to hear like the creatures in the movie "A Quiet Place" lol ..... Now maybe they can hear the difference a fuse makes :)

From what I understand, even though we can’t directly “hear” much above 20khz, the “ information “  transmitted above that can substantially affect imaging & overtones  which are important parts of sound  reproduction.