This California Health Care Foundation study shows that Americans are now living longer, and that people are becoming frailer, therefore more home care services are needed now than ever. According to statistics, the average life expectancy in 2001 was 77.2 years compared to 75.5 ten years earlier. California residents over the age of 85, who will eventually require home care service is expected to double by 2030 says the California HealthCare Foundation.
One of the major trends in the Home Care Industry is the fact that California's population
  is aging, therefore more in-home healthcare services will be required in the next decade. According to the California Health Care Foundation, by 2025, the population of those over 65 will double. This puts California in first place over any state in the United States. Sixty two percent of those who require home care are between the ages of 75-94, 7% are 95 and older, 14% are between ages of 65-74, 7% are 55-64, according to these 2005 statistics from the California Healthcare Foundation.
In the San Francisco Bay Area, these are the counties with the largest populations aged 65 years and older:

San Mateo
Population 65 years and over 88,085 12.5% of all population
Population 65 years and over with a disability 30,397 34.5% of age 65+

San Francisco
Population 65 years and over 106,111 13.7% of all population
Population 65 years and over with a disability 41,500 39.1% of age 65+

Santa Clara
Population 65 years and over 166,527 9.5% of all population
Population 65 years and over with a disability 60,610 36.4% of age 65+

Alameda
Population 65 years and over 147,591 10.2% of all population
Population 65 years and over with a disability 61,895 41.6% of age 65+