That was the initial concern. It turns out, a diverse population turns out to turn up. Let me see if I can find their study.
EDIT:
ARGH. I can't find the study I was reading during the summer. But from what I remember, roughly 25% of people were 35-45, 25% were 46-55, and probably the most amazing is the 56-65 group was around 20%!
EDIT: ARGH. I can't find the study I was reading during the summer. But from what I remember, roughly 25% of people were 35-45, 25% were 46-55, and probably the most amazing is the 56-65 group was around 20%!