The fact that you had to separate them into an age should tell you something.
Something happened in the 80s, and it wasn't "the dawn of a new technology". It happened specifically in the US, and was done by their government.
Does it surprise you that wealth takes time to accumulate? None of those people had a get rich quick scheme that made them billionaires in their 20's.
Are you referring to the antitrust breakup of AT&T in 1982?