At 68, Diane Keaton understands that marriage isn't the end-all be-all of life. The actress has dated high-profile men like Warren Beatty and Al Pacino (another famous proponent of singledom) but has spoken out about her decision to remain unmarried, saying, "I'm attracted to men, and I love playing around with them. But a life shared together? That's a different world. I think you have to be somebody who can compromise and be realistic. I could never do it. Ever."