[Nursie]

Nope, I'm not making assumptions, I'm using the data presented.

>> Given that this question is about humans

Please note that nowhere in the questions does it say the participants are human. This is one of your many assumptions.

[andrewprock]

You are correct, that the participants are people, with birthdays, and capable of speaking, is an assumption. You appear to be taking issue with that assumption. I suppose that is your prerogative, but it probably leaves you in the vanishing minority.