Final answer:
The highest frequency that young children can hear is approximately 20,000Hz.
Step-by-step explanation:
The highest frequency that young children can hear is approximately 20,000HZ. It is worth noting that as humans age, the upper limit of their hearing range tends to decrease. A useful comparison is that adults can generally hear frequencies up to 16,000Hz, while newborn babies can hear frequencies up to 25,000Hz.
Learn more about frequency hearing range in children