So there is a 2014 movie called 13 going on 30 in which a 13 year old girl wished to be older and it ended up coming true. Jennifer Garner was the star of the movie and the child actor who was her character's 13 year old self was Christa Allen. Naturally, studios would pick a child actor who had similar features to Jennifer when casting them for the role.
Fast forward many years later and Ben Affleck is now divorced from his wife and is back on the market. If you were Ben Affleck would you have just started dating a younger version of your ex-wife instead of marrying JLO?