New Law Forces Older Kids Into Child Seats SAN DIEGO - A new California law that went into effect Sunday increased the age of child required to use a car seat. The new state law indicates any child under eight years old must be in a car seat, and if the child is over eight years old and too small for an adult side seat, they also must be in that seat. It's a change from the previous law for children under six and for those weighing less than 60 pounds. The state insists keeping older kids in booster seats...