Photos show what golf's biggest stars looked like when their careers started

Ed Reinke/AP Images

• Because golf allows for longer careers, many of the best golfers have already been playing for a decade or more.
• Some golfers look entirely different now than they did when their careers began.
• Take a look at the difference below.
• Visit BusinessInsider.com for more stories.

Many of the world's greatest golfers turn pro as teenagers and grow up right before our eyes.

Yet, down the road, it is easy to forget just how much many of these golfers have changed since they started their pro careers, and how much better their fashion sense has become.

Below we take a look at what guys like Phil Mickelson, Dustin Johnson, Jordan Spieth, and Jason Day looked like before they were famous.

Dustin Johnson in 2007 (age 23).

Dustin Johnson now.

Phil Mickelson in 1991 (age 20).

See Also:

• The best cat litter boxes
• What the NBA's biggest stars looked like when their careers began
• 10 world-famous sports logos with hidden meanings