The deal, which includes a club option for 2014, will cover his arbitration years and the first year he would be eligible for free agency. The option year would cover his second year of free agency.
"It doesn't change anything," said Young. "I'm still going to go out there and play ball. I'm still going to go out there and everything is going to be the same no matter if I had a contract or I was a guy just trying to stay on the team. I'm going to play the same way.
Young declined to comment further until the deal is announced and club officials were equally mum on the subject.
Negotiations on the deal began during Spring Training, but when a deal was not initially reached, the club renewed Young's contract for 2008 for around $400,000. Talks between the two sides heated up again soon after, and while a deal was reached toward the end of spring, there were still some final details to be worked out.
The contract is believed to be close to the one signed recently by Rockies shortstop Troy Tulowitzki, which was for six years and $31 million.
Young became the first rookie in Major League history to collect at least 30 homers and 25 stolen bases last season when he hit 32 homers and stole 27 bases. His nine leadoff home runs were the fifth most in a single season.
Acquired by the D-backs from the White Sox after the 2005 season, Young had three home runs this season entering Monday's home opener against the Dodgers.
Steve Gilbert is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.