Summary: Table of age-related census data for 1990 and 2000
| | Amount |
| | 2000 | | 1990 | |
| | Illinois | National | % National | Illinois | National | % National |
| Households | | | | | | |
| All | 4,591,779 | 105,480,101 | 4.4% | 4,202,240 | 91,947,410 | 4.6% |
| Age 65+ | 1,064,919 | 24,672,708 | 4.3% | 1,021,268 | 22,154,422 | 4.6% |
| Alone | 438,693 | 9,722,857 | 4.5% | 423,740 | 8,824,845 | 4.8% |
| Not Alone | 626,226 | 14,949,851 | 4.2% | 597,528 | 13,329,577 | 4.5% |
| | | | | | | |
| Population | | | | | | |
| All Ages | 12,419,293 | 281,421,906 | 4.4% | 11,430,602 | 248,709,873 | 4.6% |
| Under 5 years | 876,549 | 19,175,798 | 4.6% | 848,141 | 18,354,443 | 4.6% |
| 5 to 9 years | 929,858 | 20,549,505 | 4.5% | 836,619 | 18,099,179 | 4.6% |
| 10 to 14 years | 905,097 | 20,528,072 | 4.4% | 796,468 | 17,114,249 | 4.7% |
| 15 to 19 years | 894,002 | 20,219,890 | 4.4% | 818,001 | 17,754,015 | 4.6% |
| 20 to 24 years | 850,843 | 18,964,001 | 4.5% | 860,087 | 19,020,312 | 4.5% |
| 25 to 34 years | 1,811,674 | 39,891,724 | 4.5% | 1,993,185 | 43,175,932 | 4.6% |
| 35 to 44 years | 1,983,870 | 45,148,527 | 4.4% | 1,700,144 | 37,578,903 | 4.5% |
| 45 to 54 years | 1,626,742 | 37,677,952 | 4.3% | 1,166,727 | 25,223,086 | 4.6% |
| 55 to 59 years | 577,747 | 13,469,237 | 4.3% | 485,581 | 10,531,756 | 4.6% |
| 60 to 64 years | 462,886 | 10,805,447 | 4.3% | 489,104 | 10,616,167 | 4.6% |
| 65 to 74 years | 772,247 | 18,390,986 | 4.2% | 821,940 | 18,106,558 | 4.5% |
| 75 to 84 years | 535,747 | 12,361,180 | 4.3% | 467,056 | 10,055,108 | 4.6% |
| 85 years and over | 192,031 | 4,239,587 | 4.5% | 147,549 | 3,080,165 | 4.8% |
| | | | | | | |
| Under Age 15 | 2,711,504 | 60,253,375 | 4.5% | 2,481,228 | 53,567,871 | 4.6% |
| Age 15-24 | 1,744,845 | 39,183,891 | 4.5% | 1,678,088 | 36,774,327 | 4.6% |
| Age 25-34 | 1,811,674 | 39,891,724 | 4.5% | 1,993,185 | 43,175,932 | 4.6% |
| Age 35-44 | 1,983,870 | 45,148,527 | 4.4% | 1,700,144 | 37,578,903 | 4.5% |
| Age 45-54 | 1,626,742 | 37,677,952 | 4.3% | 1,166,727 | 25,223,086 | 4.6% |
| Age 55-64 | 1,040,633 | 24,274,684 | 4.3% | 974,685 | 21,147,923 | 4.6% |
| Age 65-74 | 772,247 | 18,390,986 | 4.2% | 821,940 | 18,106,558 | 4.5% |
| Age 75-84 | 535,747 | 12,361,180 | 4.3% | 467,056 | 10,055,108 | 4.6% |
| Age 85+ | 192,031 | 4,239,587 | 4.5% | 147,549 | 3,080,165 | 4.8% |
| | | | | | | |
| Under Age 55 | 9,878,635 | 222,155,469 | 4.4% | 9,019,372 | 196,320,119 | 4.6% |
| Age 55+ | 2,540,658 | 59,266,437 | 4.3% | 2,411,230 | 52,389,754 | 4.6% |
| Age 65+ | 1,500,025 | 34,991,753 | 4.3% | 1,436,545 | 31,241,831 | 4.6% |
| Age 75+ | 727,778 | 16,600,767 | 4.4% | 614,605 | 13,135,273 | 4.7% |
| Age 85+ | 192,031 | 4,239,587 | 4.5% | 147,549 | 3,080,165 | 4.8% |
| | | | | | | |
| Age 65+ population living alone | 29% | 28% | | 29% | 28% | |
| | | | | | | |
| | 1990-2000 Change |
| | Amount of Change | Percentage Change |
| | Illinois | National | % National | Illinois | National | Difference |
| Households | | | | | | |
| All | 389,539 | 13,532,691 | 2.9% | 9% | 15% | (6%) |
| Age 65+ | 43,651 | 2,518,286 | 1.7% | 4% | 11% | (7%) |
| Alone | 14,953 | 898,012 | 1.7% | 4% | 10% | (6%) |
| Not Alone | 28,698 | 1,620,274 | 1.8% | 5% | 12% | (7%) |
| | | | | | | |
| Population | | | | | | |
| All Ages | 988,691 | 32,712,033 | 3.0% | 9% | 13% | (4%) |
| Under 5 years | 28,408 | 821,355 | 3.5% | 3% | 4% | (1%) |
| 5 to 9 years | 93,239 | 2,450,326 | 3.8% | 11% | 14% | (3%) |
| 10 to 14 years | 108,629 | 3,413,823 | 3.2% | 14% | 20% | (6%) |
| 15 to 19 years | 76,001 | 2,465,875 | 3.1% | 9% | 14% | (5%) |
| 20 to 24 years | (9,244) | (56,311) | (16.4%) | (1%) | - | (1%) |
| 25 to 34 years | (181,511) | (3,284,208) | (5.5%) | (9%) | (8%) | (1%) |
| 35 to 44 years | 283,726 | 7,569,624 | 3.7% | 17% | 20% | (3%) |
| 45 to 54 years | 460,015 | 12,454,866 | 3.7% | 39% | 49% | (10%) |
| 55 to 59 years | 92,166 | 2,937,481 | 3.1% | 19% | 28% | (9%) |
| 60 to 64 years | (26,218) | 189,280 | (13.9%) | (5%) | 2% | (7%) |
| 65 to 74 years | (49,693) | 284,428 | (17.5%) | (6%) | 2% | (8%) |
| 75 to 84 years | 68,691 | 2,306,072 | 3.0% | 15% | 23% | (8%) |
| 85 years and over | 44,482 | 1,159,422 | 3.8% | 30% | 38% | (8%) |
| | | | | | | |
| Under Age 15 | 230,276 | 6,685,504 | 3.4% | 9% | 12% | (3%) |
| Age 15-24 | 66,757 | 2,409,564 | 2.8% | 4% | 7% | (3%) |
| Age 25-34 | (181,511) | (3,284,208) | (5.5%) | (9%) | (8%) | (1%) |
| Age 35-44 | 283,726 | 7,569,624 | 3.7% | 17% | 20% | (3%) |
| Age 45-54 | 460,015 | 12,454,866 | 3.7% | 39% | 49% | (10%) |
| Age 55-64 | 65,948 | 3,126,761 | 2.1% | 7% | 15% | (8%) |
| Age 65-74 | (49,693) | 284,428 | (17.5%) | (6%) | 2% | (8%) |
| Age 75-84 | 68,691 | 2,306,072 | 3.0% | 15% | 23% | (8%) |
| Age 85+ | 44,482 | 1,159,422 | 3.8% | 30% | 38% | (8%) |
| | | | | | | |
| Under Age 55 | 859,263 | 25,835,350 | 3.3% | 10% | 13% | (3%) |
| Age 55+ | 129,428 | 6,876,683 | 1.9% | 5% | 13% | (8%) |
| Age 65+ | 63,480 | 3,749,922 | 1.7% | 4% | 12% | (8%) |
| Age 75+ | 113,173 | 3,465,494 | 3.3% | 18% | 26% | (8%) |
| Age 85+ | 44,482 | 1,159,422 | 3.8% | 30% | 38% | (8%) |
| | | | | | | |
| | Percent of Total |
| | 2000 | 1990 |
| | Illinois | National | Difference | Illinois | National | Difference |
| Households | | | | | | |
| Age 65+ | 23% | 23% | - | 24% | 24% | - |
| Alone | 10% | 9% | 1% | 10% | 10% | - |
| Not Alone | 14% | 14% | - | 14% | 14% | - |
| | | | | | | |
| Population | | | | | | |
| Under 5 years | 7% | 7% | - | 7% | 7% | - |
| 5 to 9 years | 7% | 7% | - | 7% | 7% | - |
| 10 to 14 years | 7% | 7% | - | 7% | 7% | - |
| 15 to 19 years | 7% | 7% | - | 7% | 7% | - |
| 20 to 24 years | 7% | 7% | - | 8% | 8% | - |
| 25 to 34 years | 15% | 14% | 1% | 17% | 17% | - |
| 35 to 44 years | 16% | 16% | - | 15% | 15% | - |
| 45 to 54 years | 13% | 13% | - | 10% | 10% | - |
| 55 to 59 years | 5% | 5% | - | 4% | 4% | - |
| 60 to 64 years | 4% | 4% | - | 4% | 4% | - |
| 65 to 74 years | 6% | 7% | (1%) | 7% | 7% | - |
| 75 to 84 years | 4% | 4% | - | 4% | 4% | - |
| 85 years and over | 2% | 2% | - | 1% | 1% | - |
| | | | | | | |
| Under Age 15 | 22% | 21% | 1% | 22% | 22% | - |
| Age 15-24 | 14% | 14% | - | 15% | 15% | - |
| Age 25-34 | 15% | 14% | 1% | 17% | 17% | - |
| Age 35-44 | 16% | 16% | - | 15% | 15% | - |
| Age 45-54 | 13% | 13% | - | 10% | 10% | - |
| Age 55-64 | 8% | 9% | (1%) | 9% | 9% | - |
| Age 65-74 | 6% | 7% | (1%) | 7% | 7% | - |
| Age 75-84 | 4% | 4% | - | 4% | 4% | - |
| Age 85+ | 2% | 2% | - | 1% | 1% | - |
| | | | | | | |
| Under Age 55 | 80% | 79% | 1% | 79% | 79% | - |
| Age 55+ | 20% | 21% | (1%) | 21% | 21% | - |
| Age 65+ | 12% | 12% | - | 13% | 13% | - |
| Age 75+ | 6% | 6% | - | 5% | 5% | - |
| Age 85+ | 2% | 2% | - | 1% | 1% | - |
Source: U.S. Census Bureau, 1990 and 2000 census data