...it depends on the show.
But they're mostly All Ages.
Here's some upcoming Jar shows that are all ages:
OCT. 5TH: Fevered Dreams, Trail of Gore, Pain Unlimited, VEHEMENCE, December, Cephalic Carnage, Kreator, & Destruction.
OCT. 31ST: WHEN HEAVEN BLEEDS, Scarlet, Eroticide, & Motive. (Possibly more).
Not at the Jar,
...but still a WICKED ASS MUTHAFUCKA:
SEP. 18TH @ The Bash on Ash(Tempe) - In Flames, KILLSWITCH ENGAGE, Dark Tranquillity, & Sentenced.
Here's another:
SEP. 30TH, @ The Big Fish Pub(Tempe) - Mortician, Scar Culture, & Malignancy.