Additional Sessions Judge Kamini Lau awarded the jail term to Delhi residents Sanjay Dhankad, 27, Bhagwan Sahai, 24, and Mohan Singh, 27 for murdering Manoj in 2010.
The court rejected the plea of the prosecution that death penalty be given to the trio, saying the case does not fall within the category of rarest of rare case.
"Now, I would like to draw a balance sheet of aggravating and mitigating factors. The mitigating factors in this case are that all the convicts namely Sanjay Dhankad, Bhagwan Sahai and Mohan Singh are young boys.
The court imposed a fine of Rs one lakh each on the three convicts and the amount would be given to Manoj's family.
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According to the prosecution, the incident took place on December 10, 2010 in a market in Hudson lane area in North West Delhi when Sanjay, Bhagwan and Mohan assaulted Manoj with bricks and sticks leading to his death.
They assaulted Manoj with bricks and sticks and also kicked him following which he fell down. However, the accused did not stop at that and picked up a flower pot made of cement and hit it on the victim's head.
Manoj's friends called PCR and along with passersby also tried to save the victim but were threatened by the accused.
Manoj was taken to police station after one of the accused falsely told the passersby that he was a chain snatcher.
During the trial, the trio claimed innocence and said that they were falsely implicated in the case.