Cameron Diaz and Benji Madden
When it comes to celebrity relationships, is age really just a number? According to a recent study, the less of an age difference there is between partners, the more likely a relationship will last. While troves of Hollywood men have been notorious for testing the limits, A-list ladies have also given junior companions a shot. Read on to discover the most memorable relationships between famous women and men who are at least five years younger, and then find out which celebrity couples have stayed together the longest.