Real age of Wil Wheaton in The Secret of NIMH
In the movie The Secret of NIMH, Wil Wheaton was:
9 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 The Secret of NIMH was released:
January 1, 1982
And the day in which Wil Wheaton was born:July 29, 1972
Since movies usually don't take more than one year to be released since the beginning of the filming process, Wil Wheaton may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.