 
Thanks again for the hints about adding the vertical line to the hist plot and in ggplot.  That worked great. 
 
Based on that advice I've been flipping through the ggplot2 doc and ggplot-static\index.html webpage more looking for the answer to the next question.  
 
Unfortunately, I haven't stumbled on a description of how to move around the location of the legend.  
 
Here is what I have so far:
qplot(Age, data = combined_data, binwidth = 1, 
         fill = combined_data$Type) + 
         scale_x_continuous("Age") + scale_y_continuous("Freq") + 
         scale_fill_discrete("Type")
 
I'm guessing there is a way to move the legend some place  thanks again.
 


      
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