One early consequence is that even young adults may lose the ability to hear very high frequency tones above 15 or 16 kHz.[5] Despite this, age-related hearing loss may only become noticeable later in life. The effects of age can be exacerbated by exposure to environmental noise, whether at work or in leisure time (shooting, music, etc.). This is noise-induced hearing loss (NIHL) and is distinct from presbycusis.