Good Genes or Good Docs

Here's the 23-year-old crooner back in 1991 (left) -- and 19 years later, the 42-year-old in NYC last month (right).

Classic.

Here's the 24-year-old in London back in 1964 (left) -- and 46 years later, the 70-year-old version at a concert in NYC on Wednesday (right).

Let it be.

Here's the 31-year-old back in 1986 (left) -- and 24 years later, the 55-year-old version at an event in Madrid on Monday (right).

Here's the 26-year-old back in 1979 (left) -- and 31 years later, the 57-year-old at an event in New Jersey on Tuesday (right).

Invincible.

Here's the 26-year-old Go-Go's lead singer back in 1985 (left) -- and 25 years later, the 51-year-old at an event in NYC on Wednesday (right).

As far as her secret, our lips are sealed.

Here's the 30-year-old back in 1984 (left) -- and 26 years later, the 56-year-old version at an event in NYC last week (right).

We see her true colors, and that's why we love her.

Here's the 27-year-old former MTV VJ back in 1994 (left) -- and 16 years later, the 43-year-old version (right) at an event in Miami on Thursday.

Here's the 22-year-old "Less Than Zero" star back in 1987 (left) -- and 23 years later, the 45-year-old version at an event in Beverly Hills last month (right).

Here's the disfigured razor-sharp character back when he starred in the original 1984 film "A Nightmare on Elm Street" (left) -- and 26 years later, the 2010 version in the new remake (right).

Here's the 33-year-old Brooklyn boy back in 1984 (left) -- and 26 years later, the 59-year-old version at an event in NYC (right).

Here's the 20-year-old Oscar winner back in 1984 (left) -- and 26 years later, the blonde 46-year-old version at an event in L.A. on Tuesday (right).

Here's the 33-year-old Oscar winner back in 1989 (left) -- and 21 years later, the 54-year-old version at an event in NYC this week (right).

Speechless.

Here's the 22-year-old former Runaways member back in 1981 (left) -- and 29 years later, the 51-year-old at her NYC film premiere this week (right).

She's a rock goddess.

Here's the 32-year-old back in 1989 (left) -- and 21 years later, the 53-year-old in NYC on Wednesday (right).

Untouchable.

Here's the 35-year-old back in 1990 (left) -- and 20 years later, the 55-year-old at an event in NYC this week (right).

Drop dead gorgeous.

Here's the 35-year-old Jersey boy back in 1984 (left) -- and 25 years later, the 60-year-old at an event in DC in December (right).

These are Bruce's glory days.