First, Fix Your Skull

No doubt about it. Size of ears is likely relevant, as well as actual acuity. Just as some people can see better than others (some folks don't wear glasses) some people can hear better than others, "better" in the sense of being able to discern a greater frequency range. Human hearing and vision are both very limited when you consider how great the range of light wavelengths and sound frequency spectrum are. We just don't see or hear what we're missing.

One good thing about getting a haircut (male) is that
recorded music, and live music, will sound better to me,
as a result.

An old expression for "haircut" was "getting your ears lowered."

Gosh, no wonder older bald audiophiles hear better. 🤗

Damn...wishing I was bald...