>"by hand" is my immediate problem ;-) I've got over 30K records to massage.

Ouch. That'd be one mighty tired hand. < s >

>OK, I'm using Sergey's code to scan the data first, running the result through your class, then adjusting the "DOB" with any variance. See any problems with this approach?

That sounds good: start with a close approximation, then adjust if necessary.

Although my AgeCalculator class wasn't designed to do so, I can see how it would be useful to be able to work backward or forwards from a given date using a fixed number of years, months, and days like you need to do here. I may add this capability to my class if I can find time.