Honestly, I think it should be raised to at least 21, the drinking age in most states...or even older. I tell ya, there are a lot of young minds out there who are so impressionable, yet they don't take the time to do their "homework" and research what and who it is they are voting for. They're easily lead by the nose into believing things that are simply not true. For example, the recent "tweet" that President Obama sent out to mostly young people, making statements in this "tweet" that have been strongly confirmed multiple times as being out and out lies.
There are some very bright young minds out there who are very capable of doing the research they need to do to vote well and do what's best for all of us and our country, but seriously, most won't do that. They're just too caught up in their friends and dating and partying to have the time to do a little simple reading. Thank you, Bud, for a great question! (: