FWIW, most kids here are 7 when they start 2nd grade and turn 8 during the year. In our area, the cut-off date for kindergarten (which affects all of the rest) is 5 by some time in October. I know that in some parts of CA where we have relatives, it is 5 by some time in December. Maybe you live in an area with a later cutoff date or have a kid with a summer birthday?
figured I oughta go straight to the horse's... mouth:
http://www.cde.ca.gov/ci/gs/em/kinderinfo.aspDistricts must admit children (to Kindy) ... if they will be five years of age on or before Nov 1 for the 2012–13 school year, Oct 1 for the 2013–14 school year, and Sep 1 for the 2014–15 school year and each school year thereafter.
Makes more sense... and it looks like CA is gradually bringing starting age into line with other states.