I find it annoying. Yes, I'm an old codger (75) but my hearing is perfect and I still quite often have trouble understanding younger people. Oddly, Spanish speakers, in my experience, seem to be more willing to slow down a little for this Gringo, but then the ones I speak to know I've only been studying Spanish for 4 or 5 years so they tend to be patient with me.

It happens most on the phone. If I call about a service or a problem, I expect to be able to understand what the person is saying. I have exasperated some people by insisting they speak slowly and clearly. I am not talking about people who speak with accented English. Most of them seem willing to slow down, speak up, or whatever is necessary.

I think that many people who provide telephone customer service get used to saying the same things over and over. They hurry though their usual speeches.

You have a right to ask people to make themselves clear.

BTW, my hearing is perfect as well. I have been tested recently.