I don't understand your comment. The survey may have formed the basis for the diversity reports, but it shouldn't be difficult to supplement them with age data, since the companies already have the information.
Thanks EC - I didn't understand his point either but I expected it - that a self appointed spokesperson for these huge tech companies will try to invent some reason why they cant get this data. Of course they can - that data is readily available. The "someone who needs to do more research" it the person who made the comment - because his "research" attempt to find a reason to discredit this failed, though I am sure there will be more by apologists for this kind of behavior. If there really is some legal reason why summary statistics on employee age data can't be released, I still have never heard of it.
I'm not trying to justify the companies' decision to not release the age data. I'm just pointing out that there is no collusion as originally claimed. All the companies disclosed data based on the government survey which is why their reporting categories look so similar.