Summary: Table of age-related census data for 1990 and 2000
| Amount | ||||||
| 2000 | 1990 | |||||
| Idaho | National | % National | Idaho | National | % National | |
| Households | ||||||
| All | 469,645 | 105,480,101 | 0.4% | 360,723 | 91,947,410 | 0.4% |
| Age 65+ | 100,742 | 24,672,708 | 0.4% | 83,623 | 22,154,422 | 0.4% |
| Alone | 38,789 | 9,722,857 | 0.4% | 32,939 | 8,824,845 | 0.4% |
| Not Alone | 61,953 | 14,949,851 | 0.4% | 50,684 | 13,329,577 | 0.4% |
| Population | ||||||
| All Ages | 1,293,953 | 281,421,906 | 0.5% | 1,006,749 | 248,709,873 | 0.4% |
| Under 5 years | 97,643 | 19,175,798 | 0.5% | 80,193 | 18,354,443 | 0.4% |
| 5 to 9 years | 100,756 | 20,549,505 | 0.5% | 90,043 | 18,099,179 | 0.5% |
| 10 to 14 years | 104,608 | 20,528,072 | 0.5% | 90,186 | 17,114,249 | 0.5% |
| 15 to 19 years | 110,858 | 20,219,890 | 0.5% | 80,438 | 17,754,015 | 0.5% |
| 20 to 24 years | 93,994 | 18,964,001 | 0.5% | 65,792 | 19,020,312 | 0.3% |
| 25 to 34 years | 169,433 | 39,891,724 | 0.4% | 152,800 | 43,175,932 | 0.4% |
| 35 to 44 years | 192,968 | 45,148,527 | 0.4% | 149,168 | 37,578,903 | 0.4% |
| 45 to 54 years | 170,248 | 37,677,952 | 0.5% | 98,907 | 25,223,086 | 0.4% |
| 55 to 59 years | 60,024 | 13,469,237 | 0.4% | 39,407 | 10,531,756 | 0.4% |
| 60 to 64 years | 47,505 | 10,805,447 | 0.4% | 38,550 | 10,616,167 | 0.4% |
| 65 to 74 years | 75,970 | 18,390,986 | 0.4% | 69,755 | 18,106,558 | 0.4% |
| 75 to 84 years | 51,889 | 12,361,180 | 0.4% | 40,112 | 10,055,108 | 0.4% |
| 85 years and over | 18,057 | 4,239,587 | 0.4% | 11,398 | 3,080,165 | 0.4% |
| Age 15 | 303,007 | 60,253,375 | 0.5% | 260,422 | 53,567,871 | 0.5% |
| Age 15-24 | 204,852 | 39,183,891 | 0.5% | 146,230 | 36,774,327 | 0.4% |
| Age 25-34 | 169,433 | 39,891,724 | 0.4% | 152,800 | 43,175,932 | 0.4% |
| Age 35-44 | 192,968 | 45,148,527 | 0.4% | 149,168 | 37,578,903 | 0.4% |
| Age 45-54 | 170,248 | 37,677,952 | 0.5% | 98,907 | 25,223,086 | 0.4% |
| Age 55-64 | 107,529 | 24,274,684 | 0.4% | 77,957 | 21,147,923 | 0.4% |
| Age 65-74 | 75,970 | 18,390,986 | 0.4% | 69,755 | 18,106,558 | 0.4% |
| Age 75-84 | 51,889 | 12,361,180 | 0.4% | 40,112 | 10,055,108 | 0.4% |
| Age 85+ | 18,057 | 4,239,587 | 0.4% | 11,398 | 3,080,165 | 0.4% |
| Under Age 55 | 1,040,508 | 222,155,469 | 0.5% | 807,527 | 196,320,119 | 0.4% |
| Age 55+ | 253,445 | 59,266,437 | 0.4% | 199,222 | 52,389,754 | 0.4% |
| Age 65+ | 145,916 | 34,991,753 | 0.4% | 121,265 | 31,241,831 | 0.4% |
| Age 75+ | 69,946 | 16,600,767 | 0.4% | 51,510 | 13,135,273 | 0.4% |
| Age 85+ | 18,057 | 4,239,587 | 0.4% | 11,398 | 3,080,165 | 0.4% |
| Age 65+ population living alone | 27% | 28% | 27% | 28% | ||
| 1990-2000 Change | ||||||
| Amount of Change | Percentage Change | |||||
| Idaho | National | % National | Idaho | National | Difference | |
| Households | ||||||
| All | 108,922 | 13,532,691 | 0.8% | 30% | 15% | 15% |
| Age 65+ | 17,119 | 2,518,286 | 0.7% | 20% | 11% | 9% |
| Alone | 5,850 | 898,012 | 0.7% | 18% | 10% | 8% |
| Not Alone | 11,269 | 1,620,274 | 0.7% | 22% | 12% | 10% |
| Population | ||||||
| All Ages | 287,204 | 32,712,033 | 0.9% | 29% | 13% | 16% |
| Under 5 years | 17,450 | 821,355 | 2.1% | 22% | 4% | 18% |
| 5 to 9 years | 10,713 | 2,450,326 | 0.4% | 12% | 14% | (2%) |
| 10 to 14 years | 14,422 | 3,413,823 | 0.4% | 16% | 20% | (4%) |
| 15 to 19 years | 30,420 | 2,465,875 | 1.2% | 38% | 14% | 24% |
| 20 to 24 years | 28,202 | (56,311) | 50.1% | 43% | - | 43% |
| 25 to 34 years | 16,633 | (3,284,208) | 0.5% | 11% | (8%) | 19% |
| 35 to 44 years | 43,800 | 7,569,624 | 0.6% | 29% | 20% | 9% |
| 45 to 54 years | 71,341 | 12,454,866 | 0.6% | 72% | 49% | 23% |
| 55 to 59 years | 20,617 | 2,937,481 | 0.7% | 52% | 28% | 24% |
| 60 to 64 years | 8,955 | 189,280 | 4.7% | 23% | 2% | 21% |
| 65 to 74 years | 6,215 | 284,428 | 2.2% | 9% | 2% | 7% |
| 75 to 84 years | 11,777 | 2,306,072 | 0.5% | 29% | 23% | 6% |
| 85 years and over | 6,659 | 1,159,422 | 0.6% | 58% | 38% | 20% |
| Age 15 | 42,585 | 6,685,504 | 0.6% | 16% | 12% | 4% |
| Age 15-24 | 58,622 | 2,409,564 | 2.4% | 40% | 7% | 33% |
| Age 25-34 | 16,633 | (3,284,208) | 0.5% | 11% | (8%) | 19% |
| Age 35-44 | 43,800 | 7,569,624 | 0.6% | 29% | 20% | 9% |
| Age 45-54 | 71,341 | 12,454,866 | 0.6% | 72% | 49% | 23% |
| Age 55-64 | 29,572 | 3,126,761 | 0.9% | 38% | 15% | 23% |
| Age 65-74 | 6,215 | 284,428 | 2.2% | 9% | 2% | 7% |
| Age 75-84 | 11,777 | 2,306,072 | 0.5% | 29% | 23% | 6% |
| Age 85+ | 6,659 | 1,159,422 | 0.6% | 58% | 38% | 20% |
| Under Age 55 | 232,981 | 25,835,350 | 0.9% | 29% | 13% | 16% |
| Age 55+ | 54,223 | 6,876,683 | 0.8% | 27% | 13% | 14% |
| Age 65+ | 24,651 | 3,749,922 | 0.7% | 20% | 12% | 8% |
| Age 75+ | 18,436 | 3,465,494 | 0.5% | 36% | 26% | 10% |
| Age 85+ | 6,659 | 1,159,422 | 0.6% | 58% | 38% | 20% |
| Percent of Total | ||||||
| 2000 | 1990 | |||||
| Idaho | National | Difference | Idaho | National | Difference | |
| Households | ||||||
| Age 65+ | 21% | 23% | (2%) | 23% | 24% | (1%) |
| Alone | 8% | 9% | (1%) | 9% | 10% | (1%) |
| Not Alone | 13% | 14% | (1%) | 14% | 14% | - |
| Population | ||||||
| Under 5 years | 8% | 7% | 1% | 8% | 7% | 1% |
| 5 to 9 years | 8% | 7% | 1% | 9% | 7% | 2% |
| 10 to 14 years | 8% | 7% | 1% | 9% | 7% | 2% |
| 15 to 19 years | 9% | 7% | 2% | 8% | 7% | 1% |
| 20 to 24 years | 7% | 7% | - | 7% | 8% | (1%) |
| 25 to 34 years | 13% | 14% | (1%) | 15% | 17% | (2%) |
| 35 to 44 years | 15% | 16% | (1%) | 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 | 1% | 2% | (1%) | 1% | 1% | - |
| Age 15 | 23% | 21% | 2% | 26% | 22% | 4% |
| Age 15-24 | 16% | 14% | 2% | 15% | 15% | - |
| Age 25-34 | 13% | 14% | (1%) | 15% | 17% | (2%) |
| Age 35-44 | 15% | 16% | (1%) | 15% | 15% | - |
| Age 45-54 | 13% | 13% | - | 10% | 10% | - |
| Age 55-64 | 8% | 9% | (1%) | 8% | 9% | (1%) |
| Age 65-74 | 6% | 7% | (1%) | 7% | 7% | - |
| Age 75-84 | 4% | 4% | - | 4% | 4% | - |
| Age 85+ | 1% | 2% | (1%) | 1% | 1% | - |
| Under Age 55 | 80% | 79% | 1% | 80% | 79% | 1% |
| Age 55+ | 20% | 21% | (1%) | 20% | 21% | (1%) |
| Age 65+ | 11% | 12% | (1%) | 12% | 13% | (1%) |
| Age 75+ | 5% | 6% | (1%) | 5% | 5% | - |
| Age 85+ | 1% | 2% | (1%) | 1% | 1% | - |