I wasn't indubitably checked out. Once or twice I had a woman look at me and smile but when I encountered the same woman again there was nothing. These were in situations where I couldn't do anything about it (was uncertain also at the time but there wasn't really an opportunity). It could have been a checking out or it could just be that I caught her on a happy day. Also, once, a woman in a professional setting was being particularly friendly. This one who was friendly after I slightly disrespected her career choice. With a buzzed head, that's all of it outside of dates as far as I can recall. The last time that I was indubitably checked out was 2012 or 2013. And I'm in shape with everything else in order (nice shoes, buzzed head which sometimes looks ok in dim lighting, varying levels of beard growth, head shape that suits baldness I think, silly PUA type accessories). So even with all of these things that I'm doing I'm not getting checked out much at all.
So I got 3 check outs in 5 years if we're being conservative and counting those as checking outs.
@Exodus2011 says that he's not in shape and has a head shape that doesn't suit baldness, and is around my height. So it stands to reason that he'd go a whole lifetime without any.