Your brain doesn't stop developing until you're 25 or so, so a couple years makes a big difference. I was the typical dumbass homophobe bully piece of shit in highschool.

Now openly I'm gay, nice to everyone, and happy with myself. To clarify, I'm not saying being gay is better, but I'm able to accept myself and shit.

And that was over the exact expanse of 16-18 years old that I changed.