In this undated photo released by See-Saw Films, British actor Ian McKellen poses for a photograph on the first day of filming for “Mr. Homes”, in which he portrays a 93-year-old Sherlock Holmes, London. Filming has begun on “Mr. Holmes,” which imagines the famous sleuth in his old age as a retiree living in seclusion by the sea. The movie, based on Mitch Cullin’s novel “A Slight Trick of the Mind,” sees the detective struggling with a failing memory and revisiting one final unresolved mystery. (AP Photo/Agatha A Nitecka, See-Saw Films)