Why is it a safe prediction that you, presently reading this, will have a significantly greater loss of hearing in your later years than your grandparents experienced? 1. Modern sounds have a lower frequency, leading to an increase in the threshold of hearing. 2. Modern sounds are louder, leading to a decrease in the threshold of hearing. 3. Modern sounds have a higher frequency, leading to an increase in the threshold of hearing. 4. Modern sounds are louder, leading to an increase in the threshold of hearing.