In terms of age categories in the county, the fastest-growing population is comprised of those age 60 and over. Within this senior category, the population 75 years of age and older is growing the fastest. The county s age distribution trends closely reflect national age trends. Interestingly, while the senior population is expected to grow, so is the population of children, as seen by public school enrollment projections. The composition and definitions of family have changed dramatically since the 1970 s.
Grandparents are often responsible for their grandchildren.
Silicon Valley households, slightly more than one in five are homes to single persons living alone. Educational Attainments Overall, Silicon Valley has a well-educated population. Almost one of every three adults in the county are college graduates. This compares to about one in four in the state and one in five nationally. The percentage of adults with graduate degrees is also impressive.