Speech banana and it's importance:
While many other sounds fall outside of the Speech Banana, audiologist and speech language pathologist are focusing on the frequencies within the speech banana because a Hearing Loss in those frequencies can impact a child's ability to learn language.
Having trained as both audiologist and speech and language pathologist will always ask clients to request a Hearing test to rule out any hearing difficulties and usually begin therapy after we get the results.
Children with recurring ear infections often miss the high frequency sounds eg.. /f/,/s/,/th/ and this can also have a knock on effect on literacy.
If you're approaching yours 50's-60's i'd recommend getting a baseline hearing test in advance as hair cells die as we age and a baseline would ensure you are able to determine if you're losing your hearing as you age be proactive.