We are a leading supplier of automotive aftermarket non-discretionary replacement parts and test solutions and diagnostic equipment -- building upon industry leading technology to be "The Global Leader for Parts and Solutions that Move Our World Today and Tomorrow" . We operate in the $130 billion automotive aftermarket for replacement hard parts in North America. Our hard parts products include light-duty rotating electrical products and brake-related products. In addition, we sell test solutions and diagnostic equipment, which were added with our acquisitions of D&V Electronics Ltd. in July 2017 and Mechanical Power Conversion, LLC in December 2018 and heavy-duty rotating electrical products, which were added with our January 2019 acquisition of Dixie Electric, Ltd.
The automotive aftermarket is divided into two markets. The first is the do-it-yourself ("DIY") market, which is generally serviced by the large retail chain outlets and online resellers. Consumers who purchase parts from the DIY market generally install parts into their vehicles themselves. In most cases, this is a less expensive alternative than having the repair performed by a professional installer. The second is the professional installer market, commonly known as the do-it-for-me ("DIFM") market. Traditional warehouse distributors, dealer networks, and commercial divisions of retail chains service this market. Generally, the consumer in this market is a professional parts installer. Our products are distributed to both the DIY and DIFM markets. The distinction between these two markets has become less defined over the years, as retail outlets leverage their distribution strength and store locations to attract customers.
D emand for replacement parts generally increases with the age of vehicles and miles driven, which provides favorable opportunities for sales of our products. The current population of light-duty vehicles in the U.S. is approximately 296 million, and the average age of these vehicles is approximately 13 years and is expected to continue to grow, in particular during recession years. Although miles driven can fluctuate for various reasons, including fuel prices, they have been generally increasing for several years.
In addition, we operate in the $11 billion-plus rapidly emerging global market for automotive test solutions and diagnostic equipment and see the opportunity for accelerating growth rates for today and the future as electrification becomes increasingly important around the world. We also operate in the $40 billion market for medium and heavy-duty automotive aftermarket replacement parts for truck, industrial, marine, and agricultural applications.