Real age of Johnny Knoxville in Jackass 3D
In the movie Jackass 3D, Johnny Knoxville was:
38 years old
That was the real age of the celebrity according to our calculation.
The calculation of the shown age took into account the first day of the year in which the movie Jackass 3D was released:
January 1, 2010
And the day in which Johnny Knoxville was born:March 11, 1971
Since movies usually don't take more than one year to be released since the beginning of the filming process, Johnny Knoxville may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.