I think the overtly emotional nature of politics is exactly why it doesn't matter if you allow 16 year olds to participate. It's such an extreme that virtually all participants are affected, regardless of how much control they have over their emotions.
I wonder if lowering the voting age would shift the "young people don't vote" window lower, or if it wouldn't change at all because it's not that young people don't vote as much as it is that as you grow older you become more invested in your lifestyle and are therefore more likely to vote to protect/preserve/enhance/whatever it.
The problem is lack of information, not emotion. Politics is immensely complicated and hard to understand without the right heuristics, and, from what I've seen, age doesn't help here much at all. People just tend to believe whatever most in their bucket believe regardless of age or even education. Logic doesn't seem to do squat, which is actually not surprising if you think about it.
Emotion tends to trump cold hard logic -- especially in the young. Actually, hell, not just the young! I'm almost 30 and can't do any meaningful thinking if I'm emotionally upset about something.
I'm just saying, I'm not sure how much value I'd place on the logic of a 16 year old in something as emotionally charged as politics.