There's no single answer to this question as the legal age to sit in the front seat of a car varies by state and country. Many places don't have a specific law about *sitting* in the front seat, but rather focus on laws regarding *passenger restraints*. These laws typically mandate that children under a certain age and/or weight must be in a car seat or booster seat, regardless of where they are seated in the vehicle. Once a child meets the height and weight requirements for their state, they are usually allowed to sit in the front seat without restriction, even if they are under the legal driving age.
To find the correct answer for a specific location, you need to consult that location's traffic laws.
