Many 13-to-17-year-olds would have more interest in the presidential election if they could vote, but I don’t believe that most teenagers are equipped to decide about issues like health care and immigration. Many teens would either not feel comfortable voting or would adopt the positions of their parents -- or vote for whichever party their friends did.
The single biggest factor in how people judge others is their appearance and manner, so many teens will vote on whichever candidate has the most appealing look. The second largest factor would be how the candidate delivers a speech or message. Because so much of our daily life revolves around technology, teenagers are used to getting information quickly, which would mean candidates would have to shorten their speeches or make them more appealing to a younger demographic.