How old do i have to be to go to the GazettE's concert by myself?

i am 14 now, and i really want to go to Gazetto's concert (the gazettE in english) eto... do i have to go with a adult, father doesnt like gazerock music. or ruki, for that matter. all of their music has a parental advisory label on it, so is there an age limit? heres one of their songs, i posted a link that has eng sub for those who need it... eto... just let me know i i have to be a certain age for this.