Demographic politics
Sheila Coronel in Who wants to be a President? points out that:

For some time now, young voters have made up the bulk of the electorate. Today a little more than half of the more than 39 million voters are below 35, with a significant number of them aged 18 to 25. In all, two-thirds of the electorate is below 45.

At the same time, the 2000 census shows that 48 percent of Filipinos now live in urban areas, compared to 37.5 percent in 1980 and 32 percent in 1970. The latest National Statistics Office bulletin says that five of the top 10 vote-rich provinces are also the most urbanized in the country. Cavite and Laguna, for example, are now more than 80 percent urban.