I think it's motivation rather than age related. Plenty of my peers had direction - and a lot of those with direction continued on those paths.
Our slightly more capable one was muttering about doing maths A level the other day. His most recent practice paper was graded U... He's not worried - everyone did badly - we hadn't done the stuff on the paper... what he means is he didn't look at the huge volume of revision material he was supposed to be referencing over summer. He was moved into top set last year so we'll have to see how that goes. He's better off getting a 3 than a U, so he might need to move back down if he doesn't improve. I think you have to get a 6 to be considered for Maths A level anyway. They're doing pretty much monthly tests in English and Maths this year, so at least we can vaguely keep an eye.
We're gonna go to the Army recruitment center in half term, but again, I don't think he'll have any actual questions to ask. He was surprised when I told him that they'll expect him to have some current affairs knowledge if he goes to the assessment center. You know, knowledge of what the British army is actually doing... where they have bases... humanitarian activities they might be involved in... when he's this nonchalant about it, I'm inclined to just leave him to it.
The other one is going to be lucky to get any/many 4s so really needs to concentrate on apprenticeships. Went to a nice college open day the other day. They said to sort CV, apply to the college now so you're on the apprenticeship list, apply for other apprenticeships you see online even if it won't go anywhere... no action has been taken. He claims he "doesn't want" to work in a shop, or an office, or be a mechanic, but puts no effort into the one or two things he maybe thinks he might enjoy.
They both know they won't be sitting on their arses, so if they haven't sorted something come September, they'll be applying for all and any jobs that are available. The Local Authority or whoever are welcome to hunt us down for breaking the rules - apparently they don't really enforce the education til 18 thing though, so I'm not worried.