Michael Douglas: Marriage Takes Nurturing To 'Prosper And Grow'

Following a year in which Michael Douglas and Catherine Zeta-Jones have been quietly rebuilding their relationship after taking a break last summer, the two-time Oscar winner says his perspective on marriage has sharpened. "A lot of it has to do with age," Douglas, 69, who costars with pal Diane Keaton in the new romantic comedy And So It Goes (out July 18), tells PEOPLE in this week's issue.