Yea, I'm sure ageism is part of it. But something definitely seems different nowadays (from both the interviewer and interviewee side of the desk), compared to 1999 or even 2005-2006. The focus these days seems to be "Find out ways to disqualify the candidate" and "Haze the chump", rather than "Find a good reason to hire him/her and then do it! We have a product to make!"
Yes, it is different - the economy is in the dumpster.
Official reports herald 1-2% GDP growth rate, but if you realize the inflation is more like 5-6% rather than the official 2% , the economy has, in reality been contracting.