That's extremely true. You know when you know and that's that. I mean with me, I had never given it any thought because my family had raised me to be a certain way... to be religious and think that anyone that was gay or anything but straight was wrong, so I never thought about it, but I did, at an early age start to realize I was slightly attracted to other girls, but I was in denial about it because I didn't wanna be like that on account of how my family would react to it.
It wasn't until after my sister came out that I actually started thinking about it, and I realized I was. But of course for a couple of months, I was in denial or just debating it... I wanted to be sure before I told anyone. And after a few months I was absolutely positive, but I was still afraid to tell my parents. So for almost a year, only my close friends, my sister and one of my cousins knew. But when I started to consider dating a girl, I decided I needed to tell my parents. I told my mom, but have yet to tell my dad,who is more hard-headed on the matter. But in time, I will. This is who I am and they need to accept that.
Age has nothing at all to do with it, and it's not immoral, or a sin. Billie Joe of Green Day once said that everyone is most likely born Bisexual and it's up to them as they grow to decide if they want to stay that way, go one way or the other. It's not wrong, the way a person feels is never wrong. LOVE is never wrong. Period.