A stroke four years ago turned 74-year-old David Walker’s life upside down, leaving the affable Navy veteran with vision trouble and paralysis in one leg. Except for occasional visits from a caregiver, Walker is mostly alone and confined to his San Francisco studio apartment.

The sense of isolation and loneliness is sometimes debilitating for a man who loves to chat about cooking, music and his many other interests. Walker’s one lifeline to the outside world is the Institute on Ageing’s Friendship Line, which connects homebound seniors via telephone to volunteers.

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