Some of the reasons as to why there's an age limit include harassment, child abuse, and many sensitive things I'm not going to talk about. The site has had some of these cases a few times and I respect the age limit because it has avoided new ones from happening.
I agree with the fact that the application process is too weak, but knowing how many people aren't going to read the rules, some of them will state their real age. It's not effective, sure, but at least it works decently.
I'm also going to digress with "looking at their behavior". That's just vehemence, toxicity and immaturity, which are some of the topics handled by the Disciplinary Team. It's just dealt with and that doesn't change anything.
Reversal would just worsen up things, in my opinion. There's 16-year olds who can be twice as mature than a 28-year old, but let's always remember that they're still underage, and when something really, really bad happens, staff needs to deal with it.
Underage harassment is very fucked up and we can't just let it happen. If the verification process isn't effective, I can assure that it's just the way it is because it can't be better than that. So? Let's just not make it worse.