Why do young people talk so fast?

Young people seem to talk really fast and mumble cause they don't open their mouths making it hard to understand them sometimes. Why is this?
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Thank you. After working for many years in heavy industry, the old ears aren't what they used to be. I've had to tell young people to slow down cause I don't hear that fast!!! Then throw in a pierced tongue and I usually don't have an idea what is being said.
Why do young people talk so fast?
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