Chance of going
                    to prison during 
Not yet             rest of life                
incarcerated    All        White    Black
by age          persons    men      men 
Birth             5.1%     4.4%   28.5%
20                4.5      4.1    25.3
25                3.1      3.0    17.3
30                2.1      2.1    10.8
35                1.4      1.5     6.5
40                 .9      1.1     3.6
45                 .6       .8     2.1

http://www.ojp.usdoj.gov/bjs/pub/ascii/llgsfp.txt