J.J.
Both my kids still like looking at fans, they are 3 and 5. My 3 yo more so than the 5 yo. I think kids just love anything spinning. If you are concerned about something like autism, don't be, my daughter is 5 and has aspergers which is on the autism spectrum and she always liked looking at them, but my 3 yo who is not on the spectrum likes them even more, so at least with my kids it didn't mean anything.