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Working your brain hard at your job could pay off in more ways than boosting your career — it may also protect your cognition and help prevent dementia as you age, a new study found.

Having a routine job with little mental stimulation during your 30s, 40s, 50s and 60s was linked to a 66% higher risk of mild cognitive impairment and a 37% greater risk of dementia after the age of 70, according to the study, when compared with having a job with high…