The movie starts of with a man not accepting the lost of his son during the war. This man wanted to turn back time before his son went to war. He built this clock that works anticlockwise trying the turn back time. He displayed this clock in a Museum. Time passed and this couple went to this museum. They ended getting pregnant. While the wife was giving birth she died and the father just couldn't bare the loss of his wife. He grabbed the baby and rushed out of the house without saying a word. After running for quiet a while he stopped and took a look at the baby. The baby was hideous, old, wrinkly and disturbing. The father got shocked and left the baby in front of an elderly home. The housekeeper Queenie (Taraji P. Henson) picked him up and took him inside. She was horrified at first but then accepted that he was a child of God and she decided to take care of him. She named him Benjamin.
Days passes by and instead of this baby growing up to be a year old Benjamin (played my Brad Pit) was getting younger. He was old in age but young in body and he was getting younger instead of older. He went to school with a 7 year old body but a face of an old man. Benjamin never gave up. In time he would eventually learn and grow.
Eventually Benjamin became a young adult and met a Daisy (Cate Blanche). He fell in love with her and they built a relationship. They had a daughter together and named her Caroline (Julia Ormond). Although she is not quiet seen in the movie.
She found out about his case and she started to take care of him as he started growing young. Everyday she was afraid that she was going to loose him. She was getting old and he was growing young.
Time passed and he became a baby. He died in her arms never knowing what and why this happened to him and why he had to live his life so different from everyone else.
This film is all about time. He has to adapt to his life and by time get used to the idea that he is not like everyone else. He has to face a lot of criticism and problems along the way. He grew young forgetting how to walk, how to talk just like a normal new born baby. The ending is very sad seeing a baby dying after all that he's been trough and not living a very easy life. His time wasn't normal and he could never have a normal life and time didn't allow him.