Previously released

★ ★ ★ ½ 56 UP The latest installment of this groundbreaking documentary series represents a bit of a holding pattern. The 13 British men and women who have been filmed at seven-year-intervals since they were 7 are now in the space between middle age and old age, and they want us to know they’re not dead yet. Essential viewing nonetheless. (144 min., unrated) (Ty Burr)