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

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

FORBES: The Great Age-Wave Ruse

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

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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