Honestly, they should just re-title this movie "Who Wants To See Blake Lively In Different Period Outfits?" Or "Blake Lively, You're Too Pretty To Be That Old!" Behold the trailer for The Age of Adaline.
So Blake Lively drives her car into a pond of ice and is then struck by lightning and never dies or ages. But she's also too afraid to kill herself so... that's the premise of this film.