Hey,
Refer to my audiogram.
Been 35 years, and my audiogram has never changed since I was first diagnosed at 3 years old.
I was mute up until then, parents didn’t find it unusual because my older bro was the same way.
Tinnitus started since my teens and never let up. At that time they investigated causes for tinnitus and discovered I have very large vestibular aqueducts connecting to the cochlea. Those aqueducts are for pressurization I think.
It was advised at the time to stop sports that can cause head trauma since a lot more fluid can rush into the cochlea from sudden movements, which could damage hair cells in cochlea. I head a soccer ball once and lost like half my hearing for 15-30min, so that adds up.
Any theories? Mine is that the larger aqueducts made me more susceptible to heat damage from a bad flu when I was an infant.