I am now inquiring for exactly what they told him. If they did indeed use that word, I will file with the EEOC within the week.
[edit: so you know, I'm keeping comments hidden on this one to reduce flame wars.]
[edit: I sent an email asking what they said. He (my AeroTek rep) replied that they went with a candidate who had about a decade less experience, but 5 years had been specifically working on this particular kind of task, so I sent him a note advising that he watch out for words like "younger" and other actionable things. I suspect that the age angle was still part of it, but he's got a conflict of interest there, and if they only HINTED, that's not provable in a hearing.]