Determining definitively which actor has the youngest wife requires precise age data for all actors and their spouses, which is not provided in the reference. The reference only names several Bollywood actors who married younger women: Saif Ali Khan, Sanjay Dutt, Aamir Khan, and Farhan Akhtar. Without access to the exact ages of all their wives and comparing them against every other actor's spouse, a definitive answer cannot be given.
However, the reference does highlight that Saif Ali Khan, Sanjay Dutt, Aamir Khan, and Farhan Akhtar are among Bollywood actors who have married younger women. Further research into the specific birthdates of these actors and their spouses would be required to identify who has the youngest wife.
Therefore, the question needs clarification to provide a precise answer. A more accurate question might be: "Which of Saif Ali Khan, Sanjay Dutt, Aamir Khan, and Farhan Akhtar married the youngest wife?". Even this question cannot be answered definitively without access to birthdate information.
