Well for starters babies cannot ride on the front seat also toddlers cant either both ground have to be in the back seat properly strapped to the seat.
Around your early teens you may be allowed to ride front seat.
i do not think you should base that on weight or height since they will be people who are real tall and are under age or are over weight and are under age as well.
about 45 pounds
a 100 pounds
Generally 90 pounds + and 5'2 + is when its safe to ride in the front seat
You have to weigh 120 pounds and have to be 16 to ride in the front
Theres no certain weight you just have to be at least 12 and weigh more than 20 lbs.
80 pounds or 4 ft an 30 inches or more
in the uk the child has to be 142cm tall.
In Tennessee, children under the age of 12 should ride in the back seat of a vehicle when available, unless the front seat is the only seating position in the vehicle. This is to protect children from the potential dangers of airbags.
you have to weigh at least 85 lbs. to ride in the passenger seat
10 years old.
150
You have to be 5 years or older or over 36 inches to ride in the front seat.