How can I change the transparency of a bar graph when I have two differnt data sets?

I am plotting 2 series of data with an arbitrary bin size (so the histogram plot looks really bad). For example:

close all

ages = [3 12 24 15 5 74 23 54 31 23 64 75];

binranges = [0 10 25 50 75];

binranges1 = [0 5 25 50 75];

[bincount,ind] = histc(ages,binranges);

[bincount1,ind1] = histc(ages,binranges1);

figure

bar(binranges,bincount);

hold on;

bar(binranges1,bincount1,'r');

I would like the image to look more like a histogram (shown next) but the histogram width looks really bad (so the smaller bin size affects the overall shape of the graph).

ages = [3 12 24 15 5 74 23 54 31 23 64 75];

binranges = [0 10 25 50 75];

binranges1 = [0 5 25 50 75];

histogram(ages,binranges);

hold on;

histogram(ages,binranges1);

I was thinking I would be able to change the facealpha property on the bar series plot but that is no longer the case. I was hoping to make the histogram have equal bin width graphically, even though the bins themselves are different sizes.

[Walter Roberson]

Which MATLAB version are you using? R2014b had no way to set the bar alpha; R2015b does have a way to set the alpha; I would need to check the records to see if R2015a had it.