Real age of January Jones in X-Men: First Class
In the movie X-Men: First Class, January Jones was:
32 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 X-Men: First Class was released:
January 1, 2011
And the day in which January Jones was born:January 05, 1978
Since movies usually don't take more than one year to be released since the beginning of the filming process, January Jones may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.