Dan:
You are right in that the second amendment, nor our state constitution mention age. As for your analogy about driving, we do have "blanket restrictions" based on age for drivers licenses. A person cannot get any kind of drivers license prior to the age of 14, and then only learners permits or provisional operators licenses that place restrictions on them above and beyond a regular drivers license. The reason for this is well-documented evidence that the brains of young people are not fully capable of the same kinds of reasoning and judgement that most adults have. Statistics show that the rates of teens having crashes are far higher than for adults, and the general conclusion is that it is the imaturity of the brain that limits their ability to make good decisions. Afterall, most teens can see better, hear better, and have faster reaction times than most adults. If there weren't for some other cause, they should fare better than adults when it comes to driving.
Even though I agree that kids should be taught about guns, even at an early age, I don't think I'd want children of any age being allowed to carry loaded fire arms around at their own discretion. Granted, college age students may not be considered children any longer, and they can go to war and all that, but it doesn't change the fact (that medical science has claimed) their brains have not yet fully developed, leaving their ability to make good judgements less than optimal.
As much as I agree with you that our state constitution and the bill of rights does not specify an age when it comes to keeping bearing arms, I have a hard time believing that even our forefathers would have wanted children running around with guns. I doubt if you are actually advocating youngsters of any age having guns, but one might surmise that from your argument.
I'm not arguing one way or the other as to the legality or wisdom of allowing guns on college campuses. I'm just putting out some more information to ponder. Personally, I'm undecided on the question.