16, however with a proviso that political and social responsibility is taught in schools from age 11 and more responsibility is given to young people generally at an earlier age. So many people feel it's okay not to vote at all, which is a real problem. Electoral complacency is something which cripples society and allows undemocratic things to slide in via the back door.
I agree with a lot of the article which states that young people no longer have enough of an adult role at an early enough age and imho that needs remedying as people my age are often woefully ill equipped to deal with things because they have never had the opportunity to actually do anything meaningful and useful to their progression as a person. I've found this when conducting interviews, half the people under 20 don't turn up, some turn up late, shambolic, only a very few actually have themselves together in any meaningful way and it's not a hard thing to teach, just not enough is expected of them imho, and that's down to our education system not teaching self discipline and how to actually 'adult' properly.