San Mateo County Historical Age Data
ACS 2010-2014 data
Total population: 739,837
Median Age (
see rank)
| San Mateo County | 39.40 years old |
| California | 35.60 years old |
| U.S. | 37.40 years old |
Median Age, Male (
see rank)
| San Mateo County | 38.10 years old |
| California | 34.50 years old |
| U.S. | 36.10 years old |
Median Age, Female (
see rank)
| San Mateo County | 40.60 years old |
| California | 36.80 years old |
| U.S. | 38.80 years old |
| | San Mateo County | % of the Total Population | California | U.S. |
| Under 5 years | 46,186 | 6.24%, see rank | 6.62% | 6.36% |
| 5 to 9 years | 46,624 | 6.30%, see rank | 6.65% | 6.51% |
| 10 to 14 years | 42,851 | 5.79%, see rank | 6.70% | 6.59% |
| 15 to 19 years | 40,959 | 5.54%, see rank | 7.12% | 6.85% |
| 20 to 24 years | 41,233 | 5.57%, see rank | 7.58% | 7.13% |
| 25 to 34 years | 103,253 | 13.96%, see rank | 14.48% | 13.47% |
| 35 to 44 years | 109,502 | 14.80%, see rank | 13.60% | 12.96% |
| 45 to 54 years | 110,932 | 14.99%, see rank | 13.79% | 14.09% |
| 55 to 64 years | 94,391 | 12.76%, see rank | 11.32% | 12.29% |
| 65 to 74 years | 56,029 | 7.57%, see rank | 6.71% | 7.64% |
| 75 to 84 | 31,737 | 4.29%, see rank | 3.72% | 4.25% |
| 85 years and over | 16,140 | 2.18%, see rank | 1.70% | 1.85% |
US Census 2010 data
Total population: 718,451
Median Age (
see rank)
| San Mateo County | 39.30 years old |
| California | 35.20 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| San Mateo County | 37.90 years old |
| California | 34.00 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| San Mateo County | 40.50 years old |
| California | 36.30 years old |
| U.S. | 38.50 years old |
| | San Mateo County | % of the Total Population | California | U.S. |
| Under 5 years | 46,360 | 6.45%, see rank | 6.79% | 6.54% |
| 5 to 9 years | 44,729 | 6.23%, see rank | 6.73% | 6.59% |
| 10 to 14 years | 42,463 | 5.91%, see rank | 6.95% | 6.70% |
| 15 to 19 years | 41,249 | 5.74%, see rank | 7.58% | 7.14% |
| 20 to 24 years | 40,098 | 5.58%, see rank | 7.42% | 6.99% |
| 25 to 34 years | 99,334 | 13.83%, see rank | 14.27% | 13.30% |
| 35 to 44 years | 108,100 | 15.05%, see rank | 13.91% | 13.30% |
| 45 to 54 years | 110,669 | 15.40%, see rank | 14.10% | 14.58% |
| 55 to 64 years | 89,187 | 12.41%, see rank | 10.84% | 11.82% |
| 65 to 74 years | 49,985 | 6.96%, see rank | 6.11% | 7.03% |
| 75 to 84 | 30,973 | 4.31%, see rank | 3.68% | 4.23% |
| 85 years and over | 15,304 | 2.13%, see rank | 1.61% | 1.78% |
ACS 2008-2012 data
Total population: 721,183
Median Age (
see rank)
| San Mateo County | 39.30 years old |
| California | 35.20 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| San Mateo County | 38.00 years old |
| California | 34.10 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| San Mateo County | 40.50 years old |
| California | 36.40 years old |
| U.S. | 38.50 years old |
| | San Mateo County | % of the Total Population | California | U.S. |
| Under 5 years | 46,276 | 6.42%, see rank | 6.82% | 6.51% |
| 5 to 9 years | 45,401 | 6.30%, see rank | 6.71% | 6.57% |
| 10 to 14 years | 41,489 | 5.75%, see rank | 6.91% | 6.68% |
| 15 to 19 years | 41,364 | 5.74%, see rank | 7.47% | 7.09% |
| 20 to 24 years | 40,267 | 5.58%, see rank | 7.49% | 7.04% |
| 25 to 34 years | 100,184 | 13.89%, see rank | 14.32% | 13.32% |
| 35 to 44 years | 108,827 | 15.09%, see rank | 13.93% | 13.34% |
| 45 to 54 years | 110,147 | 15.27%, see rank | 14.00% | 14.44% |
| 55 to 64 years | 89,628 | 12.43%, see rank | 10.85% | 11.84% |
| 65 to 74 years | 50,844 | 7.05%, see rank | 6.20% | 7.12% |
| 75 to 84 | 31,767 | 4.40%, see rank | 3.70% | 4.25% |
| 85 years and over | 14,989 | 2.08%, see rank | 1.62% | 1.78% |
ACS 2006-2010 data
Total population: 704,327
Median Age (
see rank)
| San Mateo County | 39.00 years old |
| California | 34.90 years old |
| U.S. | 36.90 years old |
Median Age, Male (
see rank)
| San Mateo County | 37.70 years old |
| California | 33.70 years old |
| U.S. | 35.60 years old |
Median Age, Female (
see rank)
| San Mateo County | 40.30 years old |
| California | 36.00 years old |
| U.S. | 38.10 years old |
| | San Mateo County | % of the Total Population | California | U.S. |
| Under 5 years | 46,182 | 6.56%, see rank | 6.95% | 6.62% |
| 5 to 9 years | 43,452 | 6.17%, see rank | 6.78% | 6.62% |
| 10 to 14 years | 40,938 | 5.81%, see rank | 7.12% | 6.79% |
| 15 to 19 years | 41,401 | 5.88%, see rank | 7.65% | 7.28% |
| 20 to 24 years | 39,980 | 5.68%, see rank | 7.37% | 6.98% |
| 25 to 34 years | 97,466 | 13.84%, see rank | 14.29% | 13.22% |
| 35 to 44 years | 109,437 | 15.54%, see rank | 14.43% | 13.89% |
| 45 to 54 years | 108,552 | 15.41%, see rank | 14.05% | 14.57% |
| 55 to 64 years | 83,872 | 11.91%, see rank | 10.28% | 11.28% |
| 65 to 74 years | 47,047 | 6.68%, see rank | 5.83% | 6.74% |
| 75 to 84 | 31,831 | 4.52%, see rank | 3.73% | 4.30% |
| 85 years and over | 14,169 | 2.01%, see rank | 1.52% | 1.70% |
ACS 2005-2009 data
Total population: 701,886
Median Age (
see rank)
| San Mateo County | 38.80 years old |
| California | 34.60 years old |
| U.S. | 36.50 years old |
Median Age, Male (
see rank)
| San Mateo County | 37.30 years old |
| California | 33.40 years old |
| U.S. | 35.20 years old |
Median Age, Female (
see rank)
| San Mateo County | 40.00 years old |
| California | 35.70 years old |
| U.S. | 37.90 years old |
| | San Mateo County | % of the Total Population | California | U.S. |
| Under 5 years | 48,779 | 6.95%, see rank | 7.44% | 6.92% |
| 5 to 9 years | 42,896 | 6.11%, see rank | 6.82% | 6.59% |
| 10 to 14 years | 40,184 | 5.73%, see rank | 7.26% | 6.83% |
| 15 to 19 years | 40,870 | 5.82%, see rank | 7.34% | 7.15% |
| 20 to 24 years | 40,445 | 5.76%, see rank | 7.20% | 7.02% |
| 25 to 34 years | 97,635 | 13.91%, see rank | 14.55% | 13.42% |
| 35 to 44 years | 110,942 | 15.81%, see rank | 14.71% | 14.18% |
| 45 to 54 years | 108,053 | 15.39%, see rank | 13.94% | 14.48% |
| 55 to 64 years | 80,758 | 11.51%, see rank | 9.81% | 10.81% |
| 65 to 74 years | 44,972 | 6.41%, see rank | 5.65% | 6.50% |
| 75 to 84 | 32,476 | 4.63%, see rank | 3.79% | 4.40% |
| 85 years and over | 13,876 | 1.98%, see rank | 1.50% | 1.71% |
US Census 2000 data
Total population: 707,161
Median Age (
see rank)
| San Mateo County | 36.80 years old |
| California | 33.30 years old |
| U.S. | 35.30 years old |
Median Age, Male (
see rank)
| San Mateo County | 35.60 years old |
| California | 32.20 years old |
| U.S. | 34.00 years old |
Median Age, Female (
see rank)
| San Mateo County | 38.10 years old |
| California | 34.40 years old |
| U.S. | 36.50 years old |
| | San Mateo County | % of the Total Population | California | U.S. |
| Under 5 years | 45,374 | 6.42%, see rank | 7.34% | 6.81% |
| 5 to 9 years | 46,930 | 6.64%, see rank | 8.05% | 7.30% |
| 10 to 14 years | 44,179 | 6.25%, see rank | 7.59% | 7.29% |
| 15 to 19 years | 40,803 | 5.77%, see rank | 7.24% | 7.18% |
| 20 to 24 years | 40,897 | 5.78%, see rank | 7.03% | 6.74% |
| 25 to 34 years | 112,122 | 15.86%, see rank | 15.44% | 14.18% |
| 35 to 44 years | 122,699 | 17.35%, see rank | 16.19% | 16.04% |
| 45 to 54 years | 102,559 | 14.50%, see rank | 12.79% | 13.39% |
| 55 to 64 years | 63,513 | 8.98%, see rank | 7.72% | 8.63% |
| 65 to 74 years | 44,742 | 6.33%, see rank | 5.57% | 6.54% |
| 75 to 84 | 32,000 | 4.53%, see rank | 3.79% | 4.39% |
| 85 years and over | 11,343 | 1.60%, see rank | 1.26% | 1.51% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
