Slightly more than half of the nearly 248 million vehicles on U.S. roads during the second quarter came from the 2000 through 2008 model years, according to Experian Automotive.

This was just one of several interesting used-car tidbits tweeted by Experian during its Automotive Market Trends and Registrations webinar chat on Tuesday afternoon.

The aforementioned vehicle count (247.9 million) was up from 246.2 million in Q2 of 2012, according to Experian.

And not only are there more cars on the road these days, they’re a good bit older.

In fact, another Experian tweet noted that the average vehicle during the second quarter was 10.9 years old.  

Looking back at the second quarter of 2009, for instance, the average age was 10.0 years, according to Experian.

That average vehicle age has steadily climbed. As for more recent data points, average vehicle age was 10.3 years in Q2 2010, 10.6 years in Q2 2011 and 10.8 years in Q2 2012.

According to the second-quarter data from Experian, people own their vehicles an average of 76.3 months.

Experian also shared data on the individual brands with the longest average length of ownernship. Topping the list was Buick, whose average ownership period was pushing 100 months. It was followed by Volvo, Mitsubishi, Chrysler and Dodge, respectively.

In a point that should resonate well with the used-car market, Experian said in a tweet that used registrations in the second quarter were up 2.7 percent.

While this is not as strong as the gain for new-car registrations (nearly 8 percent), those cars, of course, will soon make their way into the used supply chain.

Overall, there were 28.4 million vehicle registrations done this year (as of June 30), 72 percent of which were used.

In the same period of 2012, ther were 27.3 million registrations, with 73 percent being used.

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