That may be the fairest solution, but it is not the most practical or necessary one. So what that 10 year-olds can’t drive, really. Does the “injustice” of the status quo outweigh the risks that come with hyperactive 10 year olds sitting behind the wheels of SUVs? Also keep in mind that the more hoops you make 10 year olds jump through to prove their license-worthiness is more hoops for everyone else as well, if you’re goal of fairness is consistent.
These parameters only measure knowledge-based information. Any fool can tell you what the effects of alcohol are, but that doesn’t necessarily mean they are fit to be drinking. One thing about immaturity is that it makes you do stupid things sometimes. Instead of doing the smart, rational thing (like knowing when to say when), it’ll lead you to make wrong, dumbass decisions (like getting drunk and then deciding to skydive off the roof like Evil Kinevil). Can you test for maturity with a paper-based test? I don’t see how.
Why would you be willing to make that compromise unless you felt it necessary to discriminate at least on some level between minors and adults? Furthermore, if by chance it was discovered that no test could be devised to reliably determine whether or not a minor was fit to drink, give legal consent, drive, etc…would you still insist upon no age-based restrictions? Or would you be willing to go with the tried and true?
Any workable alternative (which yours is not, I’m afraid) will entail “arbitrary discrimination”. In a perfect world, every characteristic would be capable of being measured down to the thousandth nanogram, but this ain’t no perfect world. So we guesstimate when an adequate level of maturity is expected to be present and let that be our guide. It’s unfortunate that in the process a lot of mature people get denied the opportunity to drive and all that, but such is life in a world that doesn’t exactly operate like a perfect one.
Not necessarily. Coercion can mean anything from the threat of violence to “I’m going to stop loving you if you don’t do this”. The matter is clearly rape, the other is questionable.