If I write on my application that I have 25 years of experience, does that have to be excluded due to it revealing that my date of birth is likely more than 40 years ago? Can they really believe that the amount of experience isn't important?
Other steps people my age take are to stop listing dates--either select dates like university graduation, or--in extreme cases--all employment dates.
Keep in mind that there are different biases at different screening points along the way. The manager with the open position may want someone older and more experienced, but the people recruiting, screening, and filtering the candidates may be biased or simply not familiar with the value of experience that doesn't match today's buzzwords.
Does my outlook not resonate with you/other older employees?
The cover letter seems to have fallen out of fashion, but I find a couple paragraphs of prose far more revealing about a person's abilities than a resume. Of course it's also more work to craft one for every position you're interested in, and doesn't help much if you're looking to put yourself into a database for recruiters (e.g. LinkedIn or any other job site), where they force you to iterate your experience in chronological order and list technologies with no context.
I think it's important to leave off things you're not interested in. I did Perl for years but there is no amount of money that would get me to do it again, so I minimize or eliminate its presence on my resume, and put extra emphasis on the technologies I want to work with now.