Is the AARP guilty of age discrimination?

The AARP recently posted a VP, Marketing position which called for "10-15 years experience." This is frequently code for someone under 40. Whether or not the AARP meant this, it is surprising that it was not more sensitive to the issue. Given the job description, it was clear that while someone with this level might be able to do the job, someone with 25 years experience would probably be better qualified. So why did the AARP eliminate someone like that, perhaps a youth of 50?