MeasuredEstablished
20 Hz–20 kHz is a reference window
The hearing edge · A personal boundary
Hearing range is neither a binary gate nor identical for everyone. Age, sensitivity, level, and listening conditions affect perception.MeasuredEstablished
Hearing risk depends especially on level, duration, and repetition of loud-sound exposure; carrier frequency alone is not a safety measure.
Sources for this claim
Thought experimentRather than testing 'how high I can hear,' notice when listening becomes effortful and choose a comfortable level.