Source: Benefits of a Bilingual Brain.
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There’s a theory that bilingual people have stronger executive control. They are constantly making the decision in their head between which language to choose, and the executive control makes that decision. As a result, the theory suggests that executive control is somehow strengthened or even rerouted to be more efficient. Executive control controls a host of other things in the brain - it’s kind of like the control room for the higher-order thinking that makes us human, like planning and judgment. For this reason (according to the theory) bilinguals are better (according to evidence) at abstract thinking, symbolic reasoning, inhibition of inappropriate actions, more attentional control, greater creativity, greater cognitive flexibility, better filtering of sensory information, and more. All of that leads to things like being better in academics (all subjects, even math) and having better career opportunities.
In short, learn a second language because being bilingual is freaking awesome.