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On a good set of headphones that can actually reproduce the highest frequencies I can hear up to 24kHz (my own testing). On the laptop speakers I'm on right now I can hear up to 20 kHz, but the 20, 19, 18 kHz samples are rather quiet.
Beyond about 18 kHz things become more of a "I sense that there is a sound there" instead of a "I hear an audible tone." But at those highest frequencies (>20kHz) I can definitely tell when they are on vs. when they are off.
I'm 36, BTW.
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