You could use a simple calculator like

http://www.moneychimp.com/calculator/compound_interest_calculator.htmto double check that math.

With the following inputs...

Current Principal: $200,000

Annual Addition: $23,000 (max contribution in 2013 + catchup)

Years to Grow: 14 (retire at 64..."before age 65")

Interest rate: 5% (this is the only unknown so I guessed)

Result: $869,293

Grow a bigger mustache to save a bit more over that 14 year period and you've got yourself a million. Of course if your mustache grows while you're saving and you can live on a smaller amount of money, you may no longer need to get up to a million.

Play around with the numbers and see how things change. Keep in mind it's all just a wild guess.

Hope this helps!