<--- Not a doctor
Obviously they're recommended for everyone. I think the danger to kids is greater than to adults, so I would never hesitate to vaccinate my kids if I had any. However, I've never gotten a flu shot as an adult, and not having kids plays a part. I know that I'm not a hypochondriac so I don't freak out at the earliest sign of illness but if I'm sick, I'll go get treated.
The last time I got a flu shot I didn't get the flu, but I also felt like I had a mild cold for the next 364 days. To me that's always been the tradeoff, and I'll take the risk with a smile.