| Colorado |  |
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 | 2,165,983 | 50.4% | 2,135,278 | 49.6% |
| 0-4 | 152,353 | 3.5% | 145,152 | 3.4% |
| 5-9 | 158,119 | 3.7% | 150,309 | 3.5% |
| 10-14 | 160,118 | 3.7% | 151,379 | 3.5% |
| 15-19 | 159,971 | 3.7% | 147,267 | 3.4% |
| 20-24 | 162,619 | 3.8% | 143,619 | 3.3% |
| 25-29 | 175,593 | 4.1% | 156,202 | 3.6% |
| 30-34 | 172,898 | 4.0% | 159,334 | 3.7% |
| 35-39 | 185,712 | 4.3% | 180,380 | 4.2% |
| 40-44 | 186,634 | 4.3% | 184,097 | 4.3% |
| 45-49 | 167,899 | 3.9% | 166,956 | 3.9% |
| 50-54 | 140,452 | 3.3% | 138,818 | 3.2% |
| 55-59 | 96,345 | 2.2% | 98,377 | 2.3% |
| 60-64 | 70,739 | 1.6% | 73,846 | 1.7% |
| 65-69 | 57,663 | 1.3% | 63,559 | 1.5% |
| 70-74 | 47,250 | 1.1% | 57,838 | 1.3% |
| 75-79 | 36,043 | 0.8% | 49,879 | 1.2% |
| 80-84 | 21,422 | 0.5% | 34,203 | 0.8% |
| 85 | 14,153 | 0.3% | 34,063 | 0.8% |
| 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 | 1,631,295 | 49.5% | 1,663,099 | 50.5% |
| 0-4 | 129,118 | 3.9% | 123,775 | 3.8% |
| 5-9 | 130,000 | 3.9% | 123,197 | 3.7% |
| 10-14 | 116,738 | 3.5% | 110,551 | 3.4% |
| 15-19 | 116,134 | 3.5% | 108,828 | 3.3% |
| 20-24 | 122,928 | 3.7% | 115,522 | 3.5% |
| 25-29 | 144,666 | 4.4% | 144,932 | 4.4% |
| 30-34 | 161,457 | 4.9% | 160,794 | 4.9% |
| 35-39 | 154,242 | 4.7% | 151,816 | 4.6% |
| 40-44 | 131,915 | 4.0% | 130,114 | 3.9% |
| 45-49 | 94,642 | 2.9% | 95,561 | 2.9% |
| 50-54 | 72,635 | 2.2% | 73,833 | 2.2% |
| 55-59 | 63,604 | 1.9% | 66,589 | 2.0% |
| 60-64 | 57,542 | 1.7% | 63,818 | 1.9% |
| 65-69 | 50,798 | 1.5% | 60,448 | 1.8% |
| 70-74 | 36,758 | 1.1% | 46,523 | 1.4% |
| 75-79 | 24,704 | 0.7% | 37,151 | 1.1% |
| 80-84 | 14,196 | 0.4% | 25,912 | 0.8% |
| 85 | 9,218 | 0.3% | 23,735 | 0.7% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).