I chose to take a demonstration IAT test that was associated with age. The test has the participant put their fingers on two keys on the keyboard, and then has them sort pictures of young and old faces. It then associated the word good with young, and bad with old, then has you again categorize the faces. The terms are then switched to young being associated with bad, and old being associated with good. Your preference is based on how long it took you to categorize them in each trial. After finishing the test, my results were that I have a "moderate preference toward young people." This test, and others like it (some of the other test options were weapons, religions, race, weight, sexuality) are designed to measure some of our unconscious prejudices. In my case, I supposedly prefer young faces to old. Some of the other tests measure a variety of prejudices including racism, sexism, and homophobia. I would encourage you to try one of the tests yourself:
Keep in mind though, when reviewing your results that it is still unclear as to whether the IAT actually measures stereotypes, or simply the awareness of these stereotypes. So, while these research methods do make some sense in their ability to recognize these prejudices, they still lack complete validity because the scores and their findings could be based on a handful of participants with extreme scores. Nevertheless, it is an interesting and worth while site to visit.