I was politically/ideologically underdeveloped, naive and emotionally reactionary at 16. Everyone around me was too. Whenever I have ever thought I knew it all, knew what I wanted or knew what was best for me, anyone else or this country in general, I have often looked back with the benefit of age, experience and hindsight and felt differently -- but I think teenagers are particularly ignorant. You may feel jaded and world weary, but you're probably a lot more informed and invested in what happens too. I just don't feel we know enough of the world at that age.
I don't think its fair to ask a 16 year old to pay taxes toward a system they have no say in though, and the fact a 16yo can start a family or join the forces but not vote is a strange mismatch of responsibility..
Honestly? I don't want kids having the vote. They are just kids to me. Young adults at best. I know 16 year olds who would probably vote BNP or something, 16 year olds who would just mindlessly vote the way their parents do, I suspect parties would target the naivete of youth, effectively trying to exploit them, and I suspect the well educated 16 year olds would be more likely to vote than the poor, which would risk further entrenching privilege. Having said that, it could go the other way... Kids are being asked to pay for babyboomer greed right now, whether they know that or not, and its the youth who are finding it hardest to get work...
All I know is that I know I wasn't ready myself. I'd rather fewer 16 year olds started families or joined the forces, because I don't think most teens are mature enough for irreversible, life altering decisions of that gravity and magnitude either... We might have street wise teens in this country that take every opiate available and shag each other at will, but there's value in the life experience that you still continue growing well into your twenties and beyond. I'd prefer they didn't have to pay tax when working too.
Maybe if our education performed appreciably better I'd have more confidence in them.