research coming out of the UK has shown that,

Teenagers use just 20 words for a third of everything they say . .
- link


Linguist Tony McEnery of the University of Lancaster
has also found that teens use only half the words of
the average young adult, aged 25 to 34.
- link

when his findings were first reported in 2006,
McEnery cautioned,

Employers are already complaining that first jobbers are lacking basic verbal communication skills and it seems things could be set to get worse.

and today, some three years after the research data
was collected, things have indeed gotten worse

yeah, like you know consider the vid below; check
out the like speech patterns of a like you know
regular young guy