Age has always been a dicey variable in the Karate Kid universe. In The Karate Kid, Part III — perhaps the most preposterous entry in the series — the twenty-eight-year-old Ralph Macchio passed himself off as a “kid” abandoning college, with his character dating the seventeen-year-old Robyn Lively (thus lending a creepy and statutory quality to the relationship). This time around, the “kid” is truly a kid — even if the “karate” is kung fu and not karate.