**_Too old to rock 'n' roll, but not to hike the Appalachian Trail_** Robert Redford stars as an over-the-hill writer who decides to hike the 2,200-mile Appalachian Trail. After his wife (Emma Thompson) insists he get a partner, the only one who's up for the task is an old overweight friend with a drinking problem (Nick Nolte). Kristen Schaal and Mary Steenburgen have peripheral roles. "A Walk in the Woods" (2015) is a consistently amusing drama/adventure starring two seasoned veterans and it delivers the goods as low-key entertainment spiced with worthy mindfood on aging. Some people co...