10 Ways to Stay Mentally Young

As life spans continue to lengthen, it's becoming increasingly clear that our brains as well as our bodies are amazingly resilient and adaptive. Even 90-year-olds can build new muscle mass through physical exercise. So can their brains, although what's being developed is not new muscle but new synapses. And while some of the exercise that produces these effects is physical, most of it is mental.

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