| Massachusetts |  |
AGE DISTRIBUTION
Drawn as a "population pyramid," an area's age-sex structure hints at its patterns of growth. A top heavy pyramid, like the one for Grant County, North Dakota , suggests negative population growth that might be due to any number of factors, including high death rates, low birth rates, and increased emigration from the area. A bottom heavy pyramid, like the one drawn for Orange County, Florida , suggests high birthrates, falling or stable death rates, and the potential for rapid population growth. Most areas, however, fall somewhere between these two extremes and have a population pyramid that resembles a square, indicating slow and sustained growth with the birth rate exceeding the death rate, though not by a great margin.
| Age Distribution by Sex, 2000 | ||||
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Male
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Female
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| Number | Percent | Number | Percent | |
| Total Population | 3,058,816 | 48.2% | 3,290,281 | 51.8% |
| 0-4 | 203,062 | 3.2% | 194,206 | 3.1% |
| 5-9 | 221,145 | 3.5% | 209,716 | 3.3% |
| 10-14 | 221,168 | 3.5% | 210,079 | 3.3% |
| 15-19 | 210,460 | 3.3% | 205,277 | 3.2% |
| 20-24 | 198,756 | 3.1% | 205,523 | 3.2% |
| 25-29 | 213,376 | 3.4% | 220,648 | 3.5% |
| 30-34 | 242,386 | 3.8% | 250,378 | 3.9% |
| 35-39 | 266,507 | 4.2% | 274,086 | 4.3% |
| 40-44 | 255,838 | 4.0% | 266,564 | 4.2% |
| 45-49 | 225,029 | 3.5% | 236,916 | 3.7% |
| 50-54 | 199,205 | 3.1% | 212,203 | 3.3% |
| 55-59 | 148,841 | 2.3% | 161,161 | 2.5% |
| 60-64 | 111,504 | 1.8% | 124,901 | 2.0% |
| 65-69 | 98,882 | 1.6% | 117,616 | 1.9% |
| 70-74 | 91,416 | 1.4% | 119,916 | 1.9% |
| 75-79 | 73,829 | 1.2% | 111,112 | 1.8% |
| 80-84 | 46,464 | 0.7% | 84,235 | 1.3% |
| 85 | 30,948 | 0.5% | 85,744 | 1.4% |
| Age Distribution by Sex, 1990 | ||||
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Male
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Female
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| Number | Percent | Number | Percent | |
| Total Population | 2,888,745 | 48.0% | 3,127,680 | 52.0% |
| 0-4 | 211,083 | 3.5% | 201,390 | 3.3% |
| 5-9 | 193,868 | 3.2% | 184,167 | 3.1% |
| 10-14 | 178,600 | 3.0% | 169,493 | 2.8% |
| 15-19 | 206,249 | 3.4% | 203,685 | 3.4% |
| 20-24 | 254,377 | 4.2% | 259,262 | 4.3% |
| 25-29 | 277,579 | 4.6% | 279,341 | 4.6% |
| 30-34 | 269,814 | 4.5% | 274,627 | 4.6% |
| 35-39 | 239,169 | 4.0% | 245,224 | 4.1% |
| 40-44 | 211,806 | 3.5% | 222,257 | 3.7% |
| 45-49 | 164,452 | 2.7% | 172,217 | 2.9% |
| 50-54 | 126,994 | 2.1% | 136,432 | 2.3% |
| 55-59 | 120,932 | 2.0% | 132,526 | 2.2% |
| 60-64 | 121,548 | 2.0% | 140,049 | 2.3% |
| 65-69 | 111,013 | 1.8% | 141,253 | 2.3% |
| 70-74 | 85,747 | 1.4% | 121,868 | 2.0% |
| 75-79 | 59,416 | 1.0% | 100,893 | 1.7% |
| 80-84 | 33,778 | 0.6% | 73,107 | 1.2% |
| 85 | 22,320 | 0.4% | 69,889 | 1.2% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).