An 84-year-old colleague uses hearing aids but they seem to not be that effective. I got to wondering if there was an iPhone app that another person could speak into and would be sent to his bluetooth audio device (iPods, earbuds, headsets, etc.). These would not be intended to replace hearing aids, but if he were having longer conversations or informal chats with other colleagues, that might be useful. Besides, he would get the benefit of the audio devices for music, etc.
Hearing aids that are Apple compatible have a similar capability. I select Live Listen on my iPhone, hand my iPhone to the person and their voice will transmit from my iPhone directly to my hearing aids via BT. First link is Live Listen and second is supported hearing aids.
Idk. But I read or heard something about the air pods being used as hearing aids. Sounded intriguing to me. Evidently they can cut back on the annoying sounds people with hearing deficiencies often experience with regular hearing aids. Besides, I am fairly sure that hearing aids are exceedingly expensive.