Happy 50th birthday, Mustang. The original pony car turns 50 this week. Celebrate the car's transformation over the years with a look back at some of the evolution of the car over since it was first unveiled at the World's Fair in 1964.

1964 Ford Mustang

In 1964, Ford introduced the Mustang. It was
In 1964, Ford introduced the Mustang. It was a near-instant success and spawned an entire sector of so-called "pony" cars that aimed to ride on the coattails of the Mustang's success. (Credit: Ford Motor Company)

1965 Ford Mustang Shelby GT

For the Mustang's second model year, Ford introduced
For the Mustang's second model year, Ford introduced the Shelby GT version, in collaboration with performance vehicle manufacturer Shelby American, in 1965. (Credit: Ford Motor Company)

1965 Ford Mustang Fastback

Edsel Ford II, the great-grandson of Henry Ford,
Edsel Ford II, the great-grandson of Henry Ford, received this Mustang Fastback as a 16th birthday present. "That Mustang was my first car and one of my favorites," Ford said. (Credit: Ford Motor Company)

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Playboy Pink 1967 Mustang Hardtop

The
The "Playboy Pink" was a special-order color applied to first-generation Mustangs in 1964 in both hardtops and convertibles. This hardtop is owned by Horace Collums of Houston, Texas. (Credit: Ford Motor Company)

1969 Mustang Boss 429

The 1969 Mustang Boss 429 was one of
The 1969 Mustang Boss 429 was one of two Boss models produced for the 1969 model year, along with the Boss 302. The 429 is named after its 429 cubic inch, 7.0-liter V8 engine that produced 376 horsepower, making it one of the biggest, most powerful engines on the road. (Credit: Ford Motor Company)

1967 Ford Mustang

The 1967 Ford Mustang marked the first update
The 1967 Ford Mustang marked the first update to the original design and launched a trend of Ford adding incrementally to its size. (Credit: Ford Motor Company)

1971 Mustang

The last major redesign of the first generation
The last major redesign of the first generation of Mustangs was implemented on the 1971 model year. The most pronounced change was to its size, which gained 2 inches in length and almost 3 inches in width. (Credit: Ford Motor Company)

1974 Ford Mustang

In 1974, the Mustang II marked its first
In 1974, the Mustang II marked its first year, and a return to its sporty, subcompact roots. Buyers responded by flooding Ford dealerships in pursuit of the car. Pictured is the Mach 1 model. (Credit: Ford Motor Company)

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1977 Mustang Cobra II

The 1977 Mustang Cobra II brought the long
The 1977 Mustang Cobra II brought the long overdue T-Top to the muscle car. (Credit: Ford Motor Company)

1978 Mustang King Cobra

The King Cobra version of the 1978 Mustang
The King Cobra version of the 1978 Mustang featured a more sporty design. (Credit: Ford Motor Company)

1979 Fox Body Mustang

The only wagon-back concept of the Fox Body,
The only wagon-back concept of the Fox Body, a third-generation Mustang that was unveiled in 1979. (Credit: Ford Motor Company)

1979 Ford Mustang

The 1979 Ford Mustang was the first model
The 1979 Ford Mustang was the first model year of the brand's third generation. (Credit: Ford Motor Company)

1983 Mustang Convertible

The 1983 model year marked the first time
The 1983 model year marked the first time since 1973 that the Mustang was made available as a convertible. It was also the first time ever that Ford's signature blue oval graced the car, according to The Mustang Source. (Credit: Ford Motor Company)

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1986 Mustang

With the 1986 Mustang, Ford entered the second
With the 1986 Mustang, Ford entered the second phase of the pony's third generation. It marked a departure from the "four-eyes" style headlights of earlier third-generation Mustangs. (Credit: Ford Motor Company)

1988 Ford Mustang

The 1988 Ford Mustang was equipped with a
The 1988 Ford Mustang was equipped with a V-8 engine and had a starting base price of $11,150. (Credit: Ford Motor Company)

1990 Ford Mustang

By the time the 1990 Ford Mustang hit
By the time the 1990 Ford Mustang hit dealers, company engineers were already focused on the next generation, which was set to debut in 1994. As a result, there were few notable design changes. (Credit: Ford Motor Company)

1993 Ford Mustang Cobra

Ford launched the Mustang Cobra for the 1993
Ford launched the Mustang Cobra for the 1993 model year. The car's exterior was virtually identical to that of standard GT models, but featured high-performance hardware under the hood. (Credit: Ford Motor Company)

1994 Mustang Cobra

The 1994 Mustang Cobra, the first model year
The 1994 Mustang Cobra, the first model year of the classic car's fourth generation, was used as the Indy 500 pace car. (Credit: Ford Motor Company)

2000 Mustang Cobra R

The 2000 Mustang Cobra R was produced as
The 2000 Mustang Cobra R was produced as an ultra-high performance sports car that was distinguished by its distinct, large dome hood with fills and its splitter for the front bumper. (Credit: Ford Motor Company)

2007 Ford Mustang GT/CS

The 2001 Mustang GT Bullitt edition honored the
The 2001 Mustang GT Bullitt edition honored the eponymous 1968 movie and its famous Steve McQueen car chase scene. The Bullitt edition sat three-quarters of an inch lower than standard GTs and came equipped with unique shocks and sub-frame connectors. (Credit: Ford Motor Company)

2007 Ford Mustang GT/CS

The 2007 Ford Mustang GT
The 2007 Ford Mustang GT "California Special" was a tribute to the 1968 original that added design features such as side stripes, side scoops and a lowered front bumper to the base model. (Credit: Ford Motor Company)

2008 Shelby GT500KR

The 2008 Ford Shelby GT500KR was a 40th
The 2008 Ford Shelby GT500KR was a 40th anniversary edition that drew on the 1968 "King of the Road" GT500KR model. The car, which retailed at more than $120,000, featured a 540-horsepower supercharged 5.4-liter V* engine with 510 lb.-ft. of torque. (Credit: Ford Motor Company)

2014 Ford Mustang

The 2014 model year will be the last
The 2014 model year will be the last of the fifth-generation Mustangs. Ford is said to be planning a drastic redesign for the 2015 model year that will likely be unveiled in 2014. (Credit: Ford Motor Company)

2015 50 Year Limited Edition

To celebrate the Mustang's 50th birthday, Ford has
To celebrate the Mustang's 50th birthday, Ford has released just 1,964 rear-wheel coupes, available in six-speed manual transmission or six-speed automatic and in just two colors, Wimbledon White or Kona Blue only. The model will also feature louvered rear quarter windows (not available in any other models), likely to delight Mustang lovers ever. And the front bucket seats are leather, and have the 50th logo on the back of the seats.The car will be the first off the assembly line later this year, so start lining up now at your dealer (or something). (Credit: Ford Motor Company)