“Romeo and Juliet” director Franco Zeffirelli, left, with actors Olivia Hussey and Leonard Whiting at the Paris premiere in 1968. Olivia Hussey, the actor who starred as a teenage Juliet in the 1968 film “Romeo and Juliet,” has died, her family said on social media Saturday. Hussey was 15 when director Franco Zeffirelli cast her in his adaptation of the …