Age-wave theorists believe that age demographics affect U.S. stock market valuation.

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Once the U.S. comes through the age wave, it could land ahead of the rest of the world.

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In 2001, there were 18 million boomer grandparents, according to Age Wave Impact.

FORBES: Magazine Article

He calls it the Age Wave, which is also the name of his Emeryville, Calif. consultancy and a book he co-wrote back in 1989.

FORBES: Magazine Article

And in my recent New York Times article, A Gray Jobs Market for All Ages, I highlight some jobs to ride the age wave.

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The series -- about a group of space explorers given various superpowers after being hit by cosmic rays -- began a new era for Marvel Comics, signaling the start of their wave of Silver Age characters, including Spider-Man, the X-Men, the Hulk, Iron Man and many more.

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Harry Dent popularized age-wave investing among individual investors with his 1993 best-selling book, The Great Boom Ahead.

FORBES: The Great Age-Wave Ruse

The argument for age-wave theorists is made based on data from the second half of the 20th century.

FORBES: The Great Age-Wave Ruse

It's one of a new wave of groups tackling an age-old problem.

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One important kind of sleep, called slow wave sleep, gets shorter as people age.

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And, given my age at the time, and the ideological company that this second wave kept, I simultaneously found Jack Kerouac and William S. Burroughs.

NEWYORKER: Olds Rocket 88, 1950