Life, death, youth, and aging intersect uniquely in “Kimberly Akimbo,” a play about a 16-year-old girl with a genetic disease that accelerates her aging process so that she has the body and physical condition of someone more than four times her age.

“She’s a 16-year-old in a 70-year-old’s body,” says Ann Morrison, an actor and teacher of vast and varied experience, who plays Kimberly in the national tour of “Kimberly Akimbo,” a Tony-winning musical coming to Philadelphia’s Academy of Music on Tuesday for a two-week stay as part of Ensemble Arts Philly’s Broadway season.

Morrison, about half a year shy of 70, says, “I don’t have to act to understand this character. I only have to show up.”

Of course, that’s partly facetious. In conversation, Morrison is funny, upbeat, and and has much to

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