Three actresses who are too young to be his leading lady are up for the part of Johnny Depp's wife

Rooney Mara, Emily Blunt and Rebecca Hall up to play the female lead in Wally Pfister's 'Transcendence' 

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Oscar-winning cinematographer Wally Pfister is gearing up to make his directorial debut, and casting is firming up on sci-fi tale“Transcendence”, already starring Johnny Depp. Deadline reports the search for the female lead is narrowing and may be decided by this Friday.

The final three are Rooney Mara, Emily Blunt and Rebecca Hall, though Deadline warns Blunt could have scheduling conflicts with currently filming Tom Cruise actioner “All You Need is Kill.” Filming is set to begin on March 4th and the chosen actress will play a scientist named Evelyn, who is married to and uploads Depp’s character Will’s brain onto a supercomputer after his death. Casting is also underway for Max, a male friend of the couple, who helps Evelyn in protecting Will’s new form. Christopher Nolan and Emma Thomas are executive producing for their longtime collaborator Pfister, while the screenplay came from newcomer Jack Paglen.

All three actresses seem way too young to play Depp’s wife, though Hall seems like the best fit to play a scientist to us. She is, however, already playing one in “Iron Man 3″ and could be in danger of being typecast if she plays both these characters back to back. Mara, too, has tread upong seemingly similar territory, recently wrapping up filming on Spike Jonze’s “Her”, which sees Joaquin Phoenix as a man in love with a computer. Blunt is also familiar with sci-fi, most recently having appeared in Rian Johnson’s exceptional time travel thriller “Looper.”