Not all states issue non-DL photo ID for minors of any age. California does for any age. Someone mentioned that Massachusetts doesn't and I looked it up. They require a minimum age of 14 to issue their photo ID. The only gov't IDs that US citizen children will have in any state are passports and the newer passport card. Birth certificates are de facto accepted for proof of age but using them routinely comes with risks of identity theft. I suppose a permanent resident minor would have a greencard.