Remember too that the difference between hearing up to 15K and hearing up to 19K isn't really that big of a difference...less than half an octave. In addition, there's not much up there except the uppermost sizzle of some cymbals.
I'm not trivializing hearing loss.
My dad never wanted to invest in a good system because he had his hearing tested and found he couldn't hear much above 15K. In his mind, he felt like he had such serious hearing loss that he couldn't appreciate a good audio system. So he went decades without a good playback system, despite having enjoyed nice systems up until his 40s.
