“How do you take a bunch of middle-aged men (Bruce Willis is 52, Sylvester Stallone is 60 and Harrison Ford is 65) with saggy skin, creaking bones, thinning hair, paunches and back problems, and make them seem like taut, high-kicking, death-defying action stars? How do you make Ford dodging spears and dashing through the jungle look credible? How do you put the wow factor into Willis leaping from a moving plane? And how do you shoot Stallone in a tight T-shirt and headband, waving an enormous gun around, without it seeming, well, silly?”