Blake Lively says she loves the idea of getting older.

"I'm 27, so I can say 'YEAH. Bring it on.' But at 27, you haven't really experienced it. So ask me again in 20, 30 years. Maybe I'll complain. Then."

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In "The Age of Adaline," Lively stars as a woman immortalized in her 20s since the 1930s, loving and losing loved ones, watching the daughter she gave birth to reach her dotage while Adaline herself is forever young.

"To have your daughter in her 80s while you're trapped in your 20s . . . for a parent to see her child start to lose her memory, lose her strength and her independence, brings out the protector she knows she's supposed to be. . . . But age is something you can't protect them from," Lively says.

The actress plays Adaline through the ages as world-wise, but as the decades pass, she becomes increasingly world-weary. As the character loves and loses, she avoids romantic entanglements, not just "out of guilt, on her part," Lively says.

"That's the selfless way of looking at it. The selfish way of thinking about it is that it's really, really painful to lose someone you love. She's protecting herself from that. She's been through it more than once, and it's awful."