It’s not just the kids on “Fame” who want to live forever. Longevity is here to stay. And as some baby boomers age, they’re going to bore the rest of us with their high-priced pursuit of youth. Dr. Sanjay Gupta takes an hourlong look at “Chasing Life” on “Special Investigations Unit” (7 p.m. today, CNN).

The search for the 21st-century fountain of youth takes Gupta from a shady medical clinic in Moscow to so-called “blue spots” on the demographic map designating population centers rich in folks 95 and older.

Gupta also visits with Americans who believe that subsisting on a near-starvation diet will add years to their mortal span. In his defense, Gupta avoids the obvious question: Does the diet make you live longer, or does it merely seem like an eternity, subsisting on 1,200 calories a day?

¢ On two episodes of “Andy Barker, PI” (NBC, today), sleep deprivation (7 p.m.), a lady (Amy Sedaris) wronged (7:30 p.m.). As expected, this clever and very funny sitcom failed to find an audience and has been exiled to network Siberia: Saturday nights.

It’s difficult to write an epitaph for a show that avoided cruel and crude humor while emphasizing the silly and the witty. The fact that a show like this flounders while the dreadful “Two and a Half Men” flourishes tells me we are living in the Dark Ages of TV comedy.

¢ The entertainment and automobile industries have a close and perverse relationship. You can almost gauge the national anxiety about fuel prices and energy reliability by the number of dumb exploitation movies and shows extolling the pleasures of burning rubber and wasting gas. The energy crises of the 1970s spawned the “Smokey and the Bandit” movie franchise and its TV cousin “The Dukes of Hazzard.” And let’s not forget CB-radio songs (“Convoy”) and the legend of the rebel trucker!

Fast forward to 2007 and the new series “Drive” (7 p.m., Fox, Sunday). “Drive” combines elements of “Lost” and “Prison Break” and just a few whiffs of “Death Race 2000.” Strangers from diverse backgrounds are invited to engage in an illegal cross-country road race. They drive beat up pickups, minivans and muscle cars in pursuit of a grand prize of $32 million.

Today’s highlights

¢ The marital misfortunes of the wealthy become grist for the entertainment mill on “Forbes’ Most Expensive Celebrity Divorces” (5 p.m., E!).

¢ The voices of Will Smith and Robert De Niro animate the 2004 cartoon feature “Shark Tale” (7 p.m., ABC).

¢ A family reunion fizzles on “Robin Hood” (8 p.m., BBC America).

¢ Shia LaBeouf hosts “Saturday Night Live” (10:30 p.m., NBC), featuring musical guest Avril Lavigne.

Sunday’s highlights

¢ Scheduled on “60 Minutes” (6 p.m., CBS): the Duke lacrosse team; prisoners pursue a college degree.

¢ “Nature” (7 p.m., PBS) follows a creature’s 9,000-mile trek across the Pacific Ocean on “Voyage of the Lonely Turtle.”

¢ Director Sidney Pollack guest stars as an oncologist with a peculiar background on “The Sopranos” (8 p.m., HBO).