Claudia was 10 when Joshua disappeared. He was gone for 12 years. That would make her age 22.
When Claudia handcuffs Artie she says the cuffs run at 20,000 volts. In the case of electroshock weapons, voltage is meaningless. House current at 120 volts will kill you; many stun guns run at over 20,000,000 volts and merely inconvenience you. Amperage is more meaningful.