Emma Watson vs Sandra Bullock: Age and gravity-defying

 Emma Watson attends the "Gravity" premiere at AMC Lincoln Square Theater on October 1, 2013 in New York City.(Getty Images/AFP)

 Actress Emma Watson arrives for the film premiere of "Gravity" in New York October 1, 2013. REUTERS

Actress Sandra Bullock attends the premiere of "Gravity" at the AMC Lincoln Square Theaters on Tuesday, Oct. 1, 2013, in New York.(AP)

From left, screenwriter Jonas Cuaron, actor George Clooney, actress Sandra Bullock, director Alfonso Cuaron and producer David Heyman pose together at the premiere of "Gravity" at the AMC Lincoln Square Theaters on Tuesday, Oct. 1, 2013, in New York.(AP)

 Actress Katie Holmes greets actor George Clooney at the premiere of "Gravity" at the AMC Lincoln Square Theaters on Tuesday, Oct. 1, 2013, in New York. (AP)

 Actress Patricia Clarkson attends the premiere of "Gravity" at the AMC Lincoln Square Theaters on Tuesday, Oct. 1, 2013, in New York. (AP)