i was 18 when i joined, too. i don't like the peace sign because it's generic and not that cool looking. i stopped wearing it when i was in middle school. but i wear really crazy shit sometimes, it's just too boring for me. i like om, though.
Too bad its significance is lost, in that those who wear those jewels don't care about what it really means. But they do look nice and who knows, maybe some get curious and understand what it truly means.
My mum has an aum symbol necklace, crystals and I love it. Wouldn't wear it though, for fear of fucking it up. xD
I'm a product of my time. I always wear a peace sign in some fashion. I love its simplicity and what it stands for.