Un-common Sense? Common Non-sense?

OK, I'm a little worried.

Are there different levels of common sense?

Is there a certain age (for instance, SIXTEEN) where you might, for instance, have common sense on *one* level, but possibly not yet on another?

Heres a 'for instance.' On one hand, I might be willing to relinquish my car keys to a particular person who may recently have earned a driver's license, assuming that they have the common sense to keep themself alive, as well as anybody else in the vicinity of that huge collection of speeding metal pieces which they are commandeering.

However, as I walk through the kitchen, and find myself suddenly stuck to the floor like a bug in a roach motel, because THE SAME PERSON WHO I MIGHT TRUST TO DRIVE A CAR SPILLS POP ON THE FLOOR AND SIMPLY WIPES IT UP WITH A DRY CLOTH RATHER THAN USING ANY WATER OR SOAP... well, let's just say that it gives me pause for concern.

Is there any way that I can reconcile these two scenarios?

Because it's making my head hurt.