Neither Mr Caneroj nor Mr Cameron wants the voting age reduced. The Commons rejected the proposal but the House of Lords (principally the Labour and LibDem peers) tried to resurrect the matter (forgetting that their function is to examine proposals passed by the Commons not to resurrect those they have rejected). However, the matter has now finally been rejected.
http://www.theguardian.com/politics/2015/dec/14/lords-reject--lower-eu-referendum-voting-age-16
It is clear that, had this proposal succeeded (which was to be solely for the EU referendum) the pressure would then be on to extend the franchise to all elections. The reason why the LibDems and particularly Labour would like that is that 16 and 17 year olds are fresh out of State education (in fact they cannot leave it now until they are 18 – one good reason alone to reject the proposal). Being freshly educated and thus knowing everything they are far more likely to vote for a Socialist government (with about 99.9% of State school teachers being of that persuasion) and far more likely to vote for the UK’s continued membership of the EU (once again because of their recent education which has almost certainly informed them that a single European State is the only way that the UK will survive).
Under 18’s do not, in the main, pay taxes. Most of them do not work. They appear as “children” in criminal proceedings and are afforded special measures. (And along will come somebody in a minute to tell me “Ah, but me they can join the Army”. So they can. But not without parental consent and they do not get involved in front line operations).
Schoolchildren, I’m afraid, do not warrant a vote.