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John Mayer has fans of all ages ... even senior citizens! Maybe it's the Mr. Roper (from 70's show Three's Company) attire?

While arriving at LAX, the 33-year-old crooner showed off his very unique fashion sense ... plaid coat, green cargos and a funky leaf necklace. What happened to the clean cut John we love so much? Guess that style went away with Jennifer Aniston.

Find out what event John will be hosting in New York ... after the jump.