Mavis Staples has achieved every one of her life goals--except for starring in a movie. "I told Justin Timberlake, 'Look, Justin, your next movie, don't forget about me. I'll play the grandma," says the 73-year-old singer, who began her career with family band the Staples Singers as a preteen in the 1950s. "He said, 'Mavis, there's no grandma,' and I said, 'There's always a grandma!'"

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