Frankly I could happily watch Dame Judi Dench trimming her fingernails. In her new film “The Best Exotic Marigold Hotel” she manages to rise above a platitude-rich script and her scenery chewing costars but what makes it of interest to geezers is that it deals with all kinds of touchy senior issues. Could this be a trend? If “Marigold” does well at the box office, will Hollywood go geriatric? Will Warren Beatty and Julie Christie be screen lovers again? Stand by.