A motorcyclist died Friday evening in a traffic collision in Pacifica, police said Saturday.  
At least one person died late Saturday night after a vehicular accident occurred in unincorporated Contra Costa County, according to California Highway Patrol officials.  
As drivers reach 70 years of age, their rate of accidents and fatal crashes per mile driven begin to rise to levels nearing the youngest drivers. Drivers 85 years and older have the highest rates of fatal accidents per miles driven of any other age group, according to the Insurance Institute for Highway Safety. California's only age-specific law requires in-person renewals for older drivers.