Real age of Michael Keaton in Batman
In the movie Batman, Michael Keaton was:
37 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 Batman was released:
January 1, 1989
And the day in which Michael Keaton was born:September 05, 1951
Since movies usually don't take more than one year to be released since the beginning of the filming process, Michael Keaton may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.