[sulam]

First of all, I have never... and I do mean _never_ had a recruiter ask me for my birthdate. I've been in the industry for 20 years now (not 40, congrats on almost hitting THAT milestone!), so it's not like I just have low exposure.

Secondly, my advice is to do nothing special. Yes, filter your resume for things you think the company would be interested in -- you would do that regardless of your age. In general a one-pager resume is greatly appreciated by everyone. If it comes up that you've been around the block more than most, fine. You don't want to work for companies that would discriminate against you based on age anyway -- they are probably going to fail due to stupidity like not appreciating expertise learned from experience.