“It is most certainly *not* a legitimate reason to deny people the vote because you fear they are going to vote "the wrong way".”
I quite agree, Jim. That was not the basis of my argument. The question was why some politicians want the voting age lowered. I tried to answer that question and my contention is that it is the politicians’ expectations of voting intentions which drives their desire to lower the age. The conclusion to that argument is similar to yours except that, conversely, it is granting the vote in the expectation of favourable polls which drives the desire for change. In essence this is no different to denying the vote for fear of adverse results. My explanation which included the way the newly enfranchised youngsters might vote was to demonstrate that point.
The age until young people continue in compulsory education or training has just been raised to eighteen (presumably because it is considered it will now take two years longer than previously to educate children to a decent standard). It is inconsistent therefore to concomitantly lower the voting age to below that age. If young people are not old enough to leave compulsory education they are not old enough to vote.
Regards the “old enough to fight” argument, as I mentioned above now that the new Education and Skills Act is in force young people cannot simply go to work at age 16. Those between 16 and 18 who have not achieved a level 3 qualification must either remain in full time education, engage in work based training (e.g. an apprenticeship) or undertake part time training alongside work or volunteering. If the Armed Forces recruit anybody under 18 they will have to comply with those requirements and that means they most certainly will not be deemed “old enough to fight”.
So, Ikky, rather than blandly say “I cannot think of a single reason to lower the voting age” I’ve given a few (of which there are many). Your statement (with no expansion) may well apply to lowering the age to 14 or 12 or 10. But that's not the argument here anyway so it doesn't matter.