Children under 8 years of age who weigh less than 80 pounds to ride properly secured in a child safety seat or booster seat in the rear seat of the vehicle.
Sources:
http://nj.gov/lps/hts/childseats/childseats_newlaw.html
Depends the weight and height
85lbs and at least 4foot8inches
60 pounds.
the child should be at least 9 to ride in the front seat
age has nothing to do with it. the child has to be a certain height and weight.
In the state of Ohio, you only have to be 8 years of age to ride in the front seat. But if you reach other standards your child will have to remain in the back passenger seat. To sit in the front, your height needs to be 4'9" or taller. In weight you must be over 60 pounds.
In Arizona a child must be at least 5 years old to not require a child restraint, however, a child restraint need not be placed in the back seat. It is unsafe for a child of under 12 to ride in the front seat if there is an air bag.
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I think it has to do with Height and Weight rather than age
the legal height and weight is 4'10 and 92 pounds
Its not about age, its about height and weight