“Poms” (** out of four) was a disappointing comedy about a group of elderly women (Diane Keaton, Pam Grier, Jacki Weaver, Celia Weston, Rhea Perlman, and others) who try to rejuvenate their lives and revitalize themselves by starting a cheerleading squad with predictable complications! Needlessly silly and contrived, with only the good-natured performances of its talented cast to carry it. Keaton’s effortless charisma carries this about as far as it can but others (particularly Grier and Perlman) are wasted. Cook your grandparents dinner and watch “Bring It On” with them instead.