it is the grenade, it's crap, I can hear it and I'm 45 and have tinitus
Even the stealth grenade? I cant hear it but some people at work can - we have been looking into this at work and have found a few websites about it - quite interesting. Apparently your hearing ability has nothing to do with it - it is the age of the ear - have you had yours transplanted from a teenager? More here
Like I said I can hear it, I'm 45 with tinnitus and no I haven't had my ears transplanted, in fact they suffer with tinnitus because of the years I worked in the music industry, basically my ears are shot!