It's a legit question, however unfortunately worded the title was.
I think that the application is currently worded so that it'd be rare for the typical 18 year old to make it in, regardless of an age limit, due to the need to show either three years of full-time college work or three years of progressive responsibility in a full-time work setting. I don't know any 18 year old who have either, and I knew plenty, due to my prior career in youth ministry. The question, though, is whether or not the FAA is holding to that requirement in the hiring process. I hope they are.
I know that at 18, even if I were to meet the requirements on paper, I personally would've been unqualified to understand the weight of the responsibilities a controller has. I also know that I wouldn't realize that I was incompetent to hold the job and would be irritated if someone brought up my age and maturity as a limiting facotr. But, if an 18 year old were somehow able to meet the three-year requirement -- legitimately -- then that'd go a long way towards convincing me that he or she could handle it. I'm sure there are people at the Academy and further who are much older and none too capable.
Then don't read it. There're plenty of other threads here. ...on a side note, thanks for getting rid of your old avatar, it was disturbing. And not in a funny way.