Evaluate the valence intensity of the following sentence, considering the mental state of the author. Present a score between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Sentence: If it seems like a minor miracle that its septuagenarian star is young enough to be the nonagenarian filmmaker 's son , more incredible still are the clear-eyed boldness and quiet irony with which actor and director take on life 's urgent questions .