Yes, thanks for the firmware update..
The majority of people lose the high end of their hearing as they age. It's just natural.. Musicians or others who have exposed themselves to years of loud volumes will suffer more loss, or worse, have tinnitus, (a ringing in the ears)..
At any age, it is best to monitor at reasonable levels (yes, it's fun, to 'feel' the music).. But the cilia in the ear are very delicate, and the ones assigned to pick out high pitches, die at a faster rate..