'old hearing' is a correct and usable phrase in written English.
It is typically used to imply that something has been heard, discussed, or considered before, typically in a previous conversation or meeting. For example, one might say, "We reviewed this at our last meeting, but let's take another look so we can all be sure we're on the same page. No need for a long discussion - it's just a refresher on old hearing."
HE often tells audiences that for him, the war did not start in 1975; it began when he was 5 years old, hearing vicious jokes about Muslims in the playground.
"When I used the old hearing aid, I really hated it.
I watched the results unfold and remembered clearly the pain I felt at 12 years old hearing my grandmother fearfully predict that what happened would lead to war.
I grieve for the Martin family, and for Trayvon Martin, as I grieved for George and his family when I was 10 years old, hearing of my best friend's death.
It takes my breath when I think about standing with you at a funeral for four of your students, participating in rituals hundreds of years old, hearing prayers sung in the voices of, at times, a hundred men.
For children under 5 years old, hearing and vision difficulties were used to determine disability status.
When the oldest man in town — a hundred and two years old — heard the news, he killed himself, rather than flee, the papers reported.
Adults and children (8 and 5 years old) heard stimuli that were either synthetic speech or hybrids consisting of sine wave targets and synthetic cosignals.
There are memories too of when her town came under American naval bombardment, and of the shock she felt as a 20-year-old hearing Emperor Hirohito's voice for the first time, like all Japanese, announcing that Japan had been defeated.
Young people can hear audio frequencies ranging from about 30 hertz to 18 kilohertz, but, as they grow older, hearing ranges from about 100 hertz to 10 kilohertz.
Digital technology allows fine-tuning to address the wearer's specific loss rather than amplifying sounds indiscriminately, a common complaint about older hearing aids.
