National Institutes of Health reports that 50 percent of those who are 75 and older have disabling hearing loss. read it here and read it here: Quick Statistics About Hearing
Induction loops, aka hearing loops are the preferred over assistive devices.
Hearing loops vs. hearing aids alone
Hear the difference in and out of the hearing loop.
Hearing Loop Demonstration with and without – Train Station – New York
Hear just how powerful a loop system can be. Dr. Sterkens’s recording made in a church dramatically demonstrates how much clearer speech is in the loop than out of the loop.
Click to hear the demos: Without the loop In the loop
People with hearing loss surveyed.