This comic novel adaptation, about an elderly couple who take an ancient RV from Massachusetts to Hemingway’s House down in Key West, may give dementia a “cute” veneer.

But when you’ve got Dame Helen Mirren and the durable Donald Sutherland behind the wheel, there’s the promise of something magical. Good to see the Oscar winner’s still tackling indie films. Good to see Sutherland survived “The Hunger Games” and is as game as ever.