Answer:
It entirely depends. "Young People", would need to be particularly defined, as it can mean many different things to different people. 1<em>8 can be considered the cut off for "Young People" for the current US government</em>, but young people is subjective in the viewpoint depending on each individual.
For this question, we would therefore assume that a young person is one who has not reached puberty and is still on the early stages of adolescent. Firstly, we must address the teenagers themselves. Many teenagers are not <em>motivated enough to participate in political votes</em>, especially with what is viewed as downsides, such as having to serve on the jury. Historically, they were also viewed as <em>not being particularly interested in politics, and relied heavily on their feelings rather than information</em>.
In my opinion, the current age of 18 is fine. 18, after all, is when most healthy individuals are entered into the draft list for service when it is needed, and if they are able to serve in the military, they should be able to vote on policies that decide their fate.
So no, young people shouldn't be able to vote. However, it entirely depends on the context of "young people".