First, I agree with several others: find out what others CAN find out about you. No matter what job you apply for, these things may come up if you don't know what's out there.
Common sense says this doesn't matter, but I'm sure there are several statisticians that could prove a strong correlation between underage drinking citiations and adult alcohol abuse.
Finally, I had 2 MIPs. One <18 and was expunged, the other at 19 where I had to pay a fine, also. I have a bi-annual ritual that includes a full background check and credit history report. I'm not even a professional pilot. I do want to know what is out there about me when I seek employment, insurance, credit, or an apartment/house. FYI: neither MIPs have ever shown up.
It's worth the $50-$250 for the info. Especially if it's for a flying gig.