It could be that your eardrum is no longer on duty – it has stopped vibrating. It could be that the tiny bones in your middle ear stopped doing their dance. It also could be because of damage to the hair cells in your inner ear caused by the noise of your blender on overdrive (if you are an obsessive 8-hours-a-day smoothie maker or Youtube star), or the fact that you blow-out hair all day long. None of the above might explain it: you might even blame your parents for inherited disorders, or just the facts of life – age.