The opening sequence of 'Children of Men'

In the opening sequence of the Thriller 'Children of Men' which was filmed in 2006 by the director 'Alfonso Cuaron', we are instantaneously drawn into its story. The film is set in the year 2027, In the opening we find out at the start that the youngest person in the world named 'Baby Diego' has been assisinated, at the age of 18. This makes us the viewer automatically inquisitive as to why the youngest person in the world is 18 years old.We start to wonder why there are no children on the earth in the year 2027. The thriller has been building as up for a red herring because just as we start to think about the assisination and the main character walking around, the explosion nearby instantaneously takes our attention, making us want to watch on even more because we want to find out, why the bomb went off, and who set it off, as well as the reasoning behind the assisination est.