Heck, I'm 35 so I must be a Metal Guru
I'm not really sure what "knowing metal" means, but I know I've certainly experienced more than a 16 year old and I've got a greater understanding of how the metal scene has developed and progressed throughout the years. I've been listening to metal since 1987. Before I even graduated High School I had seen Sepultura w/ Max, Slayer, Anthrax, DRI, Nuclear Assualt, Kreator, Napalm Death, Death, Carcass, Morbid Angel, Sacred Reich, Ministry, Biohazard, Cro-Mags, Overkill, Helmet among many others.
I'm certainly not a metal expert, and music is all about what you like anyway. I do find it amusing though going to shows and standing next to kid who could literally be MY kid
Anyway, that In Flames set is pretty sweet...and I'm still psyched to see them next Friday!
It's going to be mint!