How old was Martha Plimpton in The River Rat?

Age is one of those behind-the-scenes facts that fans love to uncover. That knowledge can reshape how we view their performance. Here’s the answer to that particular curiosity.

During the filming of The River Rat, Martha Plimpton was:

13 years old

Our analysis shows that this was the celebrity’s true age during filming.

To determine the age, we considered the first day of the year The River Rat premiered:

January 1, 1984

And the known birth date of Martha Plimpton:

November 16, 1970

Movies tend to be released within a year of filming, so Martha Plimpton may have been one year off from the listed age in certain scenes.