Working on Poisson/Normal number distributions for ages.

Possible resources:
http://www.ssa.gov/OACT/STATS/table4c6.html
http://stackoverflow.com/questions/750325/java-generator-for-poisson-and-uniform-distributions
http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/distribution/PoissonDistribution.html