Good Genes or Good Docs

Samuel L. Jackson's looks are off the chains.

Here's the foul-mouthed 47-year-old "Pulp Fiction" gangster hanging out in Beverly Hills back in 1995 (left) -- and 18 years later the 64-year-old "Django Unchained" actor at a benefit gala earlier this month (right).

Dean Cain is a Superman.

Here's the 26-year-old "Lois and Clark" actor back in 1993 (left) -- and twenty years later, the 46-year-old "Ripley's Believe It or Not" host at the Philly Comic-con last month (right).

Do ya still think Rod Stewart's sexy?

Here's the 29-year-old "Maggie May" singer back in 1974 (left) and nearly 40 years later, the 68-year-old British rocker on a morning television show (right).

"Some Guys Have All The Luck."

Will Smith is still fresh.

Here's the 24-year-old former rapper/television star at an event in 1993 (left) -- and 20 years later, the 44-year-old blockbuster king at the premiere of his unfortunate new flick "After Earth" in New York City this week (right).

Parents just don't understand ... how he ages so well.

Janet Jackson looks like a billion bucks.

Here's the 17-year-old "Control" singer back in 1983 (left) -- and 30 years later, the 47-year-old "Rhythm Nation" diva at an amfAR event in Cannes this week (right).

Miss Jackson ain't nasty.

Missy Elliott sure knows how to work it.

Here's the 26-year-old female rapper back in 1998 (left) -- and 15 years later, the 41-year-old gettin' her freak on at an event in Las Vegas this week (right).

She's supa dupa fly.

Rosie Perez is still a fly girl.

Here's the 27-year-old former "In Living Color" choreographer back in 1992 (left) -- and 21 years later, the 48-year-old "Fearless" star in Beverly Hills this week (right)

Brooklyn accents don't crack.

For Kate Capshaw, being Steven Spielberg's wife definitely has its perks.

Here's the 33-year-old "Indiana Jones and the Temple of Doom" star back in 1987 (left) -- and 26 years later, the 59-year-old natural beauty at a charity event in Beverly Hills this week (right).

Giving up acting in films really agrees with her.

New Kids on the Block have got the right stuff.

Here's Danny Wood, Joey McIntyre, Donnie Wahlberg, Jordan Knight and Jonathan Knight during their boy band heyday in 1989 (top) -- and 24 years later, Joey, 40, Danny, 43, Donnie, 43, Jordan, 42, and Jonathan, 44, in NYC recently (bottom).

They're hanging tough.

Here's the then 41-year-old "I Feel For You" singer back in 1994 (left) -- and 19 years later, the Queen of Funk-Soul celebrating her 60th birthday this week (right).

She is not every woman.

Here's the 33-year-old ginger beauty back in 1994 (left) -- and the 52-year-old "Game Change" star last month (right).

The kid is all right.

There's nothing prehistoric about "Jurassic Park" star Jeff Goldblum.

Here's the 33-year-old hipster icon back in 1985 (left) -- and 28 years later, the 60-year-old "Independence Day" star in Beverly Hills this week (right).

He's so fly.

There is something mysterious about how well David Duchovny ages.

Here's the 33-year-old "The X-Files" star back in 1994 (left) -- and 19 years later, the 52-year-old hunk at the premiere of his new movie "Phantom" this week (right).

Californication does the body good.

Steven Spielberg's films aren't the only thing that are timeless.

Here's the 42-year-old Oscar winner back in 1989 (left) -- and 24 years later, the 66-year-old at an award show in Beverly Hills earlier this month (right).

Classic.

It's hard to wrap your head around how well Valerie Harper has aged.

Here's Bethenny Frankel the 36-year-old "Rhoda" star back in 1976 (left) -- and 37 years later, the 73-year-old "Valerie" (which later became "The Hogan Family") star in L.A. this week (right).

She's irreplaceable.

Helena Bonham Carter has never looked better.

Here's the 20-year-old "Harry Potter" star back in 1987 (left) -- and 26 years later, the eclectic 46-year-old in London this week (right).

She's anything but les miserables.