I have been in the investment business for 38 years. I invest more money in a day than you have made in your life.
There is a "know nothing" here, but it ain't me.
The DIJA is an index of 30 stocks...yes, 30 stocks, out of about 5000 (and of those 30, half have been crushed over the past 6 years). Last I checked, the NASDAQ, S&P 500, and a multitude of other, wider indexs were still well off their highs.
The DIJA is for public consumption purposes, and has very little to do with anyone's 401K, etc....unless you own the 30 DIJA stocks (in which case, congrats...you are exactly where you were 6 years ago).