Glennie writes:

More specifically, at the bottom of...
  http://glen_gordon.tripod.com/LANGUAGE/origin.html
Language is reeeally old, folks. Can we reconstruct the theoretical Proto-World, the mother of all human languages? No. Why? Because language doesn't have a sudden beginning. It's as old as life itself. Even bacteria use "language", in a manner of speaking. So, there's nothing special about human language unless we can come up with a far more accurate definition of the term.

Dear Glennie, what you write above brings a tear to my eye.  Yes, language is as old as life itself.  Now on your chart above, you place Dene-Asiatic as the lead hypothetical language.  Do you have a date for Dene-Asiatic?  Guess what?  I'll buy your Nostratic at 15,000 BCE (give or take). 

BTW, is there a vocabulary associated with Dene-Asiatic?

Gerry