Are high frequency noise dangerous

Does the range of sounds we can hear decrease as we get older?

While age-related hearing loss isn't the norm, it's a fairly common condition:

The results showed that the prevalence of central presbycusis increased with age and that the highest Prevalence in the over 80 age group considerable 95 percent .

The rest of my answer is based on this book, some parts of which exist online (which I will quote). I will refer specifically to this part of the website.

Sklivvz already answered your first two questions, but here is a graphic to illustrate:

Consequently have Patients with age-related hearing loss often have normal sensitivity at low frequencies, but increasingly poor sensitivity at higher frequencies as shown here:

As you can see from the graph, the severity of age-related hearing loss depends on the sound frequency: Older people need high-pitched tones to be displayed louder in order to be able to hear them.

3. Does this mean that high frequency noise becomes less harmful with age?

It actually does! But that's because the damage has already been done ...

Not much is described on the website, but the book explains that there is a relationship between the volume of a sound and the frequency. Noises that are close to our hearing thresholds (below 20 Hz and above 20,000 Hz in the normal, healthy hearing range) cannot harm us, even if they are extremely loud. We do not hear them because they do not cause a mechanical change in our ear that responds to these frequencies and consequently no harm is done. With age-related hearing loss, the hair cells in the inner ear, which are supposed to react to high-frequency noises, no longer react, so that nothing can be harmed.

Here is a plot of the relationship between volume and frequency in hearing, where you can see that noise around 4 kHz is the easiest to harm us. Human language is in this area, so we are particularly sensitive to it:

Does this explain that when I was young I was more sensitive to noise and slept less well?

Probably not, unless it was mosquitoes that kept you busy.

Does this fact indicate a trend in our change in musical tastes over time?

I don't see that.