What is the context of this text? If it is from an old French text, then "je est" might be grammatically correct (modern usage is "je suis"). If it is a philosophy text, then some of the abovementioned translations might be more likely.

BTW, the translation for "I am 12 years old" (J'ai douze ans) does indeed literally mean "I have 12 years"; but the verb for have is avoir.