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San Mateo County’s Median Age

Health by Numbers

Did you know the median age of San Mateo County residents is 39 years old? This is slightly older than the median age for neighboring counties San Francisco (38 years old) and Santa Clara (36 years old). Residents with the lowest median age live in San Bruno, San Mateo, West Menlo Park, and East Palo Alto. The resident median age is highest in Portola Valley and East Menlo Park. Knowing the age of individuals in a population is important in determining how to meet current and project future age-specific health, social, and economic needs. 

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