There's an "awful lot" to worry about in the marketplace these days, but if investors avoid all the noise and focus on the long term, they can be successful, index mutual fund pioneer Jack Bogle said Tuesday.



"This is a hard time to invest because there aren't a lot of good options to stocks, and bond yields are extremely low," said Bogle, who founded The Vanguard Group in 1974 and launched the first retail index fund a couple of years later.

In an interview with CNBC's "Power Lunch," Bogle said the general level of securities prices is high thanks to the Federal Reserve's low interest rate policy.

"That's a scary thing because it can't stay that way forever," he said. "So, I do advocate a cautious approach to investing."