Why do many under 40 Americans talk with a vibration in their voice? Normally towards the end of a sentence.

Watching videos on YouTube over the past 10 years i noticed that many Americans have a croaky/vibration in their voice towards the end of a sentence, it seems rather recent as I don’t remember it many years ago, but maybe I just didn’t notice.

I have older friends in the states and none of them have that characteristic to their voice, it seems to be people below 40, strangely seems more prevalent in women.

Does the vibration/croaky voice have a name?

Edit-called vocal fry. Thanks everyone who responded, great help.

Not criticising, just genuinely curious where it came from & do Americans notice it also?