test table:
             around120
    1982-1991 FALSE  TRUE
        FALSE 11384  1501
        TRUE   3432   775

test:
2-sample test for equality of proportions without continuity correction

data:  testtable 
X-squared = 126.0205, df = 1, p-value < 2.2e-16
alternative hypothesis: two.sided 
95 percent confidence interval:
 0.05476682 0.08068266 
sample estimates:
   prop 1    prop 2 
0.8835080 0.8157832