Susan Sarandon age 66, caught in the act with her panties down, makes being on the other side of the hill, sexy! And in terms of style, energy and love of life, same goes for Diane Keaton and Robert DeNiro. I’m sure it comes as no surprise, that these three are the reason to see writer/director Justin Zackham (screen writer of The Bucket List) new movie The Big Wedding. Screen Picks: You seem to have a fascination with people who are experiencing a vital  second or third act in life. What is it about this subject matter that attracts you? Justine Zackham: “I feel like thaere aren’t a lot of…