The age in which a child can stop using a car seat or booster seat varies from state to state. In Michigan, the child safety seat law says that a child under the age of eight years old must be in a safety seat unless they are taller than 4' 9.
A child must be at least 25 kilograms or nine years of age before being able to leave the booster seat
In some places age does matter i think its around 7 8 years old but they also have to meet the weight an height requirements .
It is not age but pounds for a child seat. Check with your DMV, but I think it is over 40lb.
It depends on the parents decision. But I wouldn't put a 10-12 year old child in a booster seat.If they're over 3'5 then they don't have to have a booster seat. What helps is to not have a booster seat and have just a cushion/ pillow underneath there bottom so that the seat belt doesn't hurt their stomach or hurt anything else.
the weight to sit in a booster seat is...40 pounds AND the age of 4 years, BUT preferably the child is longer.
in all states a child has to be 4foot nine to be out of a booster seat. they can be in a booster sear at any age.
I'd say about 3-6 but they have to be a certain height and weight so it's different w/ every kid. Comment from Phatcharapimon : it depends on which types of booster seats; i.e. some may help safely transport "big kids" from 30-100 pounds, etc. (http://astore.amazon.com/healthy-care-booster-seat-20/detail/B004GEC8LU)
the age in cairns is 8 but i do not no the age
10 years
The age that a child should use a car seat booster is when they are 2 years of age. Some kids need to use them a little bit earlier because weight and height has an effect on how earlier the kids need to use the booster seat.
At the age of 8, children can sit in the back seat without a booster seat. They do need to have a seat belt; however, and not be in the front. They need to be securely fastened as well.
If you are still the age that you have to sit in a car seat then you can but you have to be taller than the airbag