It depends on the ages of the 39 people. If those were 39 eighty year olds, that would be seriously impressive. If those were 39 twenty year olds it would be ex

It depends on the ages of the 39 people. If those were 39 eighty year olds, that would be seriously impressive. If those were 39 twenty year olds it would be expected. There's no reason to expect that the 39 would have a similar age distribution to the population because it's not a random sample.