+Table 8. Percent of adults ever incarcerated in a State or Federal prison, by year of birth and age+ Percent of adults ever incarcerated in a State or Federal prison, by age-- Year born 20 25 30 35 40 45 50 55 60 65 70 75 1910 0.4% 0.9% 1.2% 1.3% 1.4% 1.5% 0.5% 1.5% 1.5% 1.5% 1.5% 1.5% 1915 0.4 0.9 1.2 1.3 1.4 1.5 1.5 1.5 1.5 1.5 1.5 1.6 1920 0.4 0.9 1.2 1.3 1.4 1.5 1.5 1.5 1.6 1.6 1.6 1.6 1925 0.4 0.9 1.2 1.3 1.4 1.5 1.5 1.6 1.6 1.6 1.6 1.6 1930 0.4 0.9 1.2 1.3 1.4 1.5 1.6 1.6 1.7 1.7 1.7 +1.7+ 1935 0.4 0.9 1.2 1.3 1.4 1.6 1.7 1.8 1.8 1.9 +1.9 1.9+ 1940 0.4 0.9 1.2 1.3 1.5 1.7 1.8 2.0 2.0 +2.1 2.1 2.1+ 1945 0.4 0.9 1.2 1.4 1.7 1.9 2.1 2.3 +2.3 2.4 2.4 2.4+ 1950 0.4 1.0 1.4 1.7 2.1 2.4 2.7 +2.8 2.9 2.9 2.9 2.9+ 1955 0.5 1.1 1.7 2.2 2.7 3.2 +3.4 3.6 3.6 3.7 3.7 3.7+ 1960 0.6 1.4 2.1 2.9 3.5 +4.0 4.3 4.4 4.4 4.5 4.5 4.5+ 1965 0.7 1.7 2.8 3.7 +4.4 4.9 5.2 5.3 5.3 5.3 5.4 5.4+ 1970 0.9 2.2 3.4 +4.4 5.1 5.6 5.8 5.9 6.0 6.0 6.0 6.0+ 1975 1.1 2.6 +3.9 4.9 5.7 6.1 6.4 6.5 6.5 6.5 6.5 6.5+ 1980 1.2 +2.7 4.0 5.0 5.7 6.2 6.4 6.5 6.6 6.6 6.6 6.6+ Note: Based on constant age-specific first incarceration rates after 2001 (bolded type--indicated with plus (+) signs). ---------------------------------------------------------------------- Among persons born after 1935, the effects of rising first incarceration rates occurred at increasingly younger ages. Persons born in 1955 were the first to record higher prevalence rates at all ages, compared to persons born in prior years. At age 45 the percent ever having been in prison reached 3.2% for persons born in 1955 -- more than double the percent at that age among persons born in 1930 or earlier. The greatest rise occurred in the percents having been incarcerated among the most recent cohorts. For persons born in 1975, 2.6% had been to prison by age 25, nearly equal to the percent among persons born in 1950 who had been to prison by age 50 (2.7%).