ear
/îr/
noun
- The seed-bearing spike of a cereal plant, such as corn.
- The vertebrate organ of hearing, responsible for maintaining equilibrium as well as sensing sound and divided in mammals into the external ear, the middle ear, and the inner ear.
- The part of this organ that is externally visible.
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Most native speakers can hear the distinction. Like Peter Shor said, saying "an ear" and "a year" can help the listener understand which one you mean. Words beginning with vowel sounds always use "an", but words starting with consonants ("y" is a consonant here) use "a".
Some examples of "ear" and "year". All I can say is that "year" begins with a harder, tighter "y" sound, while "ear" has a relaxed, smooth "e" sound.
The huge majority of Americans do both make and hear a difference in the sound of the words "ear" and "year." That fact that you do not hear that difference merely means that one of the sounds does not exist in your native language. My daughter-in-law's native language is Cantonese. I cannot distinguish all six tones; my ear was not trained from a young age to register differences in tone.
I assure you that if you say
The girl is six ears old
Americans will understand you, but they will also immediately identify you as a non-native speaker.