> This is what they are testing (human capacity to create random numbers declines 25+) Not really; what they're testing is what kinds of response differently-

> This is what they are testing (human capacity to create random numbers declines 25+) Not really; what they're testing is what kinds of response differently-aged people give to their question. So it's important what the question actually is; and it's important if the question might, for example, seem to older people to be a waste of their time. They're not measuring what they claim to be measuring.