Probability of retirement event This is elementary, but not clear to me.
Suppose I know that the mean age of retirement is $\mu$ and the standard deviation $\sigma$.
What is the probability that someone of age $x$, who has not yet retired, 
will retire sometime in the next year,
i.e., between $x$ and $x+1$?
Clearly for small $x$, far below the mean, the probability is near zero, and for large $x$, it approaches $1$.  So it is a type of cumulative distribution...
Thanks for your help!

Integrate the Gaussian probability density function from x to x+1
