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as spartan III's were conscripted into service at the age of six, then trained for six years before being sent on combat missions i would say noble 6(A.K.A spartan-312 according to this wiki and the official Halo:Reach strategy guide)would be between 12–13 years old although searching this wiki for moar info wouldn't hurt...and yes i did say MOARThat's classified.

Noble Six is 19. His company was finished training and deployed at age 12, sven years before the fall of Reach in 2552, so he is about 19 years old.

His years in Beta company indicate he is 21–27 years old at the time of Halo: Reach

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