"Harlan Grove" wrote:

dagostm wrote...
Hello: I am trying to figure out the average age of a varying
population of employees on 40 specific days over a three year
period.

Is this retrospective, so you know who the employees are? If it's
prospective and since you provide no demographic information other
than the implicit 'working age', you're on your own.



It is retrospective. I have everyone's date of birth.