Good Genes or Good Docs

Alicia Silverstone is still a total betty!

Here's the 18-year-old version of the uber-cute "Clueless" star at a premiere in Los Angeles back in 1994 (left) -- and 20 years later, the now 37-year-old mother and author at a book signing in New York earlier this month (right).

Bob Saget's looks are nothing to laugh at!

Here's the then 38-year-old "Full House" patriarch at a hockey game in Los Angeles back in 1994 (left) and 20 years later, the foul mouthed 57-year-old father of three at a book event in New York City earlier this month (right).

Leslie Mann she looks good!

Here's the then 24-year-old "Cable Guy" babe at a premiere in Los Angeles back in 1996 (left) and 18 years later, the now 42-year-old mother of two at a movie conference in Las Vegas earlier this year (right).

Julie Bowen's beauty is a modern miracle!

Here's the then 26-year-old babe in the golf comedy "Happy Gilmore" back in 1996 (left) -- and 18 years later, the 43-year-old "Modern Family" mom earlier in the year in Sydney, Australia (right).

Salma Hayek has always kept a lid on her incredibly good looks.

Here's the then 32-year-old "Dogma" actress showing off in a lilac "Blossom" inspired bucket hat at an LA premiere in 1998 (left) and 16 years later -- the now 47-year-old "30 Rock" star looking tough in a black biker cap at a fashion show in Milan earlier this month (right).

Our hats off to her.

Elle Macpherson is a model of genetic superiority.

Here's the then 25-year-old Sports Illustrated cover girl at a New York City event back in 1989 (left) and 25 years later -- the now 49-year-old mother of two at a fashion event in Paris earlier this year (right).

Elle-oh!

Kurt Russell's looks are "The Thing" that dreams are made of.

Here's the then 38-year-old "Captain Ron" star at a movie theater in Universal City back in 1989 (left) -- and 25 years later... the now 62-year-old A-lister at the Sundance Film Festival earlier this year (right).

Cate Blanchett's face has a curious case of the "Benjamin Button."

Here's the the 29-year-old "Elizabeth" actress at a premiere back in 1998 (left) -- and 16 years later, the flawless 44-year-old "Lord of the Rings" face at a Beverly Hills hotel last week (right).

Tim Allen's looks need no major improvements.

Here's a 39-year-old version of the "Home Improvement" patriarch at an awards show in Los Angeles back in 1992 (left) -- and 21 years later, the 60-year-old "The Santa Claus" actor on the red carpet in Beverly Hills earlier this year (right).

Martin Sheen's looks are not "Badlands."

Here's the 35-year-old version of the "Apocalypse Now" actor giving a grimace back in 1975 (left) -- and 38 years later, the 73-year-old "The West Wing" alum shootin' the same smile at a gala in Dubai (right).

Mike Tyson's face is a knockout!

Sheryl Crow's look is a little bit country and a little bit rock-n-roll!

Here's the then 33-year-old "All I Wanna Do" singer at an APLA benefit back in 1995 (left) -- and 18 years later -- the now 51-year-old mother of two at a gala in New York City this year (right).

Pierce Brosnan's looks cannot be shaken or stirred.

Here's the 34-year-old version of the "Remmington Steel" stud at an awards show back in 1987 (left) -- and 26 years later, the 60-year-old ".007" star at a gala last month (right).

Jack Nicholson's looks are "As Good As It Gets."

Here's the then 41-year-old "The Shining" actor at a Hollywood movie premiere in 1978 (left) -- and 35 years later the 76-year-old silver screen stud at a boxing event in Las Vegas earlier this year (right).

The question is...

There's "No Doubt" Gwen Stefani's looks are rock steady.

Here's the 28-year-old punk rock princess putting her best bindi forward at the Grammys back in 1997 (left) -- and 16 years later the 44-year-old mother of two (soon to be three) at a gala last week (right).

Andie MacDowell's looks are stuck in a time loop.

Here's the 35-year-old star at a premiere of the movie "Groundhog Day" back in 1993 (left) -- and the now 55-year-old mother of three at a studio in New York City earlier this week (right).

Deja vu.

The question is...