"Never Too Late," co-directed by R.J. Cutler ("The September Issue," "Billie Eilish: The World’s a Little Blurry") and David Furnish, who is Elton’s husband, sets what has become Elton’s living-fast-and-bottoming-out agony-of-fame mythology in the context of a detailed and archivally rich account of that period. So watching it, it means something again.