Bruce Jenner's changing face over the years

If change is good, Bruce Jenner must be having a great life.

The man who won the Olympic decathlon gold medal nearly 40 years ago looks very little like the man who may now be best known as Kim Kardashian's stepfather.

He's currently going through the ultimate physical change as he transitions from a man to a woman, but the truth is, Bruce's appearance has been dramatically evolving for years…at least from the neck up.

We've created the special video above which condenses more than four decades of change into 55 seconds.

And just think, there's so much more to come.