One would argue that someone would always get hurt, because it's too young of an age to properly consent to sex, let alone be in any kind of serious relationship.
The odds that you meet your "soul mate" at the age of fourteen is extremely unlikely, and the reality is that all it's leading to is future mental or even physical abuse or a messy break up so many years down the line.
Guys that old can't date girls that young because whether they like it or not, they're manipulating them. Your partner should never look up to you, rather, it should be a sort of - well - partnership. They ideally should be your "better half".
Some men get confused, and fall into the "big brother" type of relationship with little girls, or girls that are emotionally damaged/stunted, but should you enter a romantic/sexual relationship it will never end well; you're going to be wanting for something you'll never get. Which is a partner on equal footing, and this will make itself painfully clear when you need guidance, but the person who is supposed to be your partner has nothing to say to you.