How a 91-Year-Old Geek Helped Keep the Aged Independent

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Silicon Valley entrepreneurs are finding their next big idea in the elderly capital of America.

While the world’s biggest firms have struggled to develop products targeted at older consumers, a group led by former Apple Inc., Microsoft Corp. and EBay Inc. employees yesterday unveiled Lively. The system of tiny sensors helps the elderly maintain their independence, letting far-flung relatives know whether they take their pills on time or exit the house.