They won't entertain sealing the juvenile record while charges are pending. But if it is only an arrest, it shouldn't be an issue.
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You can seal juvenile while it's pending. See Welf. & Inst. Code 781 et seq.
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You're definitely old enough to get the juvenile arrests sealed. The court has to be persuaded that you are rehabilitated, however. I certainly don't think a DUI at 30 shows that you're not rehabilitated from whatever charge you picked up as a minor, but it could stand in the way.