As long as it’s not a protected class. For instance, I was once a hiring manager and everyone I was talking to was shocked when I said I would rather hire someone older and more stable. They thought I was opening them up to a lawsuit. Being under 40 is not a protected class. Being over 40 is.

I also told the recruiter that I wasn’t going to hire a guy because he smelled like cigarette smoke, I would be working closely with him and it bothered my asthma. Cigarette smoking is not protected in some states - including mine.