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Dennis Greene wrote: > Median refers to the age itself, not to the numbers afflicted. It > is derived by finding the middle point between the age of the > youngest and oldest age of onset As you point out, median age is different from average age. But the meaning of the phrase "median age" with which I am familiar is that age than which half of the population in question is older and half is younger. I do not know of a term for the midpoint of a range. Or is this one of those words that means one thing in America and another in Oz? ;-) Just to add to the confusion, there is a third concept, the most frequently occuring value. This is what would be meant by saying that most people are diagnosed at age 57. The statistical term for this is the "mode". Phil Tompkins Hoboken NJ 60/9