"D A Stocks" writes:

I visited a consumer technology exhibition at one of the clients I was
working at a few years ago. We were invited to stand in front of a
camera and watch on a nearby screen while a system worked our age,
sex, social class and other information, displaying the results next
to our faces on the screen. For me it was fairly close within a few
seconds (certainly close enough for targeting ads) and very accurate
within a minute. I think the other information included how we were
feeling that day...

I do not know if it is a permanent exhibit, but I saw this in the
Science Museum a few months ago. It was popular with am almost permanent
queue to 'have a go'.