How many women's sports teams does the oldest higher education institution on San Diego County support at the varsity level?
San Diego State Aztecs:  The Aztecs currently sponsor six men's and thirteen women's sports at the varsity level. San Diego State University: San Diego State University (SDSU, San Diego State) is a public research university in San Diego, California, and is the largest and oldest higher education institution in San Diego County.
thirteen women's sports