The aging bull market may soon finally come to an end, according to one markets pro.

"We think we're closer to the end of this bull market than we are to the beginning," said John Eade, president of Argus Research. "Once we cycle through this up earnings period, investors may want to start thinking more cautiously or defensively."

Eade noted that investors who need funds within the next two to three years may want to reduce exposure to stocks, particularly high multiple stocks. "Those could be at risk," he said. 

The S&P 500 is up 11.6% since the start of the year. 

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