[amitport]

No, that's not ageism - Also that's almost never how the story goes.

The last paragraph is more commonly:

He/she applies to a position relevant to his/her skills, and makes the mistake of listing all is previous experience in the resume - No response. After a while, he downplays his resume - gets responses. In the interview he/she answers every question with great accuracy, but something just doesn't "click" to the interviewer (the interviewer is sure he/she is filtering on skill alone, but is very wrong about that)

The fact is, recruiters and interviewers hire people they like, people that are similar to them. If you're from the same place look similar and from a similar age it generally has a lot more weight than anything skill-related.