NEW YORK - Stop me if you've heard this one before: There's this famous car brand whose average driver is more familiar with Social Security than social media.

General Motors Co. will make another attempt to get Buick to appeal to younger buyers with freshened up versions of the Regal midsize sports sedan and the LaCrosse large luxury car. GM unveiled the pair Tuesday ahead of the New York auto show.

Youth has been the theme of several of Buick marketing campaigns during the last three decades, with famous pitchmen from Tiger Woods to Shaquille O'Neal. Sales have even risen recently after a dramatic and lengthy decline. But even with that recent success, odds are against GM making Buick a go-to option for large numbers of drivers below the age of 40.

Buick, once coveted for its understated elegance, used to be a dominant brand. In 1984, GM sold 942,000 Buicks in the U.S., according to Ward's AutoInfoBank. But many Buick buyers died, and younger people opted for SUVs and cooler European cars. Sales tumbled, bottoming out at just over 102,000 in 2009. GM only kept the brand alive because it became a huge seller in China.

The company doesn't expect Buick sales to approach 900,000 per year again. But executives say they can still make a lot of money selling the higher-priced luxury vehicles with lower sales numbers.

GM is giving the LaCrosse a more sculpted, modern look. It gets updated LED daytime running lamps and tail lights and a larger front grille. On the inside, it gets new, more supportive seats and a modernized center stack with fewer buttons than the current car. The interior will have more of a luxury feeling to differentiate it from the sportier Regal.

The Regal gets similar cosmetic changes on the outside. Inside, more supportive seats and a simpler dashboard and center console give it a sportier look. GM's 2.4-liter four-cylinder "e-Assist" engine, with a small electric motor that helps boost gas mileage, becomes standard. A new, more powerful version of GM's 2-Liter turbocharged engine, with 259 horsepower, is in the sportier models, the turbo and GS.

GM says the Regal will be more responsive, refined and efficient than the previous model.

The LaCrosse goes on sale late this summer and the Regal comes out in the fall.

The new products have helped to change Buick's demographics. In 2006, Buick buyers on average had celebrated 64 birthdays. Last year that fell to 57, according to the company, The average car buyer in the U.S. is 52, according to the TrueCar.com auto pricing site.