| |
| Age Group | Male | Female | Colorado, 2000, Universe: 001 Total population Universe Population: 4,301,261 | ||
| Population | Pct | Population | Pct |  | |
| Total | 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 | |