Morpheus explained to Neo that the rebels have a rule against freeing minds after they reach a certain age because they have become so accustomed to the Matrix that the shock might kill them. The other generalized implication is that the rebels seek out young (i.e. teenage) minds who possess a questioning nature, dissatisfied with the world around them because they subconsciously recognize that the Matrix isn’t real.
Thus people that the rebels free from the Matrixtend to be teenage computer-hackers, dissatisfied with the rigid constraints of reality within the Matrix. How well this applies to Trinity is unknown, but ultimately Morpheus himself freed her from the Matrix.
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