Irrespective of age, without hearing impairment, an individual should be able to comfortably hear the 8000 Hertz. People under 50 usually can hear the 12,000 Hertz, and under 40 15,000 Hertz respectively. Individuals under 30 should hear the 16,000 Hertz and, 17,000 Hertz is comfortably receivable for healthy individuals under 24.