Even though it's illegal, an interviewer may ask your age when trying out for a job. Business Insider recommends redirectiong your answer to focus on experience.
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Ultimately, you face a choice in answering this question. If you tell them it's an illegal question -- which it is -- you risk not getting the job. The interviewer may ask out of ignorance rather than malice. Sometimes hiring managers just don't know proper questions.
Instead of refusing the question, Business Insider has some tips on phrasing your answer in such a way that redirects the question, suggested by workplace expert Lynn Taylor. The answers focus on your job experience or skills, rather than your chronological age. For example:
"If you're concerned about my level of experience, I have focused on this specialty area for several years and contributed [xyz] to my former employers. I'd like to expound on some of the projects that specifically relate to this job description -- and the excellent results I achieved. Would that be helpful?"
Check out the link for other ways to respond to the question.
When an Interviewer Asks Your Age [Business Insider]