[bullsandabears]

I agree on the bigger question. I thought I was communicating the lack of random samples, but I appreciate you pointing out why just referencing the sample size is not good enough in a sense. Anyways, they practically required lack of randomness. Their sign-up took place at the same school and "requested that participants be traditional college students of heterosexual orientation". Then they obtained the older generation participants by getting the first group to hand over addresses of their older relatives, neighbors and employers. I don't think it could get much less random.