Imagine if you could rewatch the last 12 years of your life in just two-and-a-half hours. That’s exactly what 20-year-old Ellar Coltrane did as the star of Richard Linklater’s latest film, “Boyhood.” Coltrane plays Mason Evans, Jr., a young boy living in Texas with his older sister, Samantha (Lorelei Linklater), and single mother, Olivia (Patricia Arquette). What unfolds is a masterfully woven tale of what it means to grow up: Linklater takes us through Mason’s childhood, from the earnest conversations he has with his father about the potential existence of elves, to the difficulties of dealing with a less-than-exemplary stepfather, to first love and beyond. Indeed, “Boyhood” spins the mundane hum of everyday life into a work of art about the human condition.