I had my DL suspended when I was 17 for 90 days (I am 31 now). My state requires it on the second traffic violation under age 18. I have reported it on every medical in the section where it asks if my license has EVER been suspended. I have never had an issue with the FAA or any employers. I think it is more of a drug / alcohol thing. I am not sure what one would do if they forgot to report it, but I think honesty is the best policy. I could see how someone could inadvertently miss it.

Interesting side note: There was a short time when I was legal to fly an airplane but not to drive a car. I had even checked with the FSDO at that time to make sure it was ok.