First of all, you don’t need to label yourself ever, but I get the desire to have something to associate yourself with. Some people know what they are from the moment they’re born, but others it takes a while to figure out how they identify. Your age, in my eyes, doesn’t make any difference since everyone knows at different times.
You may be bicurious, if you’re unsure and don’t feel 100% certain that you like two genders. Some people are sure without ever having to try anything (since it isn’t like you have to ask someone straight how they know they’re straight if they haven’t had sex, yet every other sexual orientation gets that question), but some people do need to test the waters to see if it’d just curiosity or they do indeed find more than one gender attractive.
Sorry if that doesn’t make sense, feel free to message again in case another admin can explain better.
~ Admin Fae