The problem is you cannot blanket cover or generalise everybody under a certain age group, or whatever it may be, each individual case is different, this goes for benefits as-well, i was having a political discussion with a friend and we both agree its hard to say who does and doesn't deserve benefits! Anyway that's a bit off-topic...
i passed my test 3-4 years ago and the test was thorough.... much harder than it used to be, older people now wouldn't have much chance... to be honest i see drivers 50+ being cocks and then 17,18 being cocks too... its not about the age its about maturity and even if we all pass the test and its super hard doesn't mean the minute we get in the car on our own we will drive the way we did in our test...
we all know the "proper" way to drive, how many of us actually do it, this is the issue... enforcing it... that is why the speed limit is what it is.