i had a more complicated version, using today, year functions, not a one stepper by any means (4 steps really)
just a comment: given the usual time lag with demographic data, you might want to consider using a constant for your current year instead of a now or today function depending on the time period your stats are covering.
mean age in 2000 using 2000 data would be wrong if you used now/today functions in your calculations, any more wrong in another month when your PC's date switches to 2002.
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