Answer:
Deeper Voice (low-frequency sound)
Step-by-step explanation:
For me, I would talk to an elderly person who has trouble hearing me in a deeper voice because at least it's not too loud. If you talk to a person with a higher voice (high-frequency) it can just affect their hearing more.... when you scream, that a high-frequency and sometimes it bothers your ears, so for me in general I would use a deeper voice.
Hope this helped!
Have a supercalifragilisticexpialidocious day!