First things first: What on earth is even an OK age to start dating? recommends looking at each situation and deciding if it is appropriate. Your first reaction might be: Dating? Already? But they seem so young! And of course, they are. But what is the appropriate age for teens to start dating?. A common rule of thumb, at least on the internet, is that it's okay to be interested in someone “half your age plus seven” years. According to this.