Final answer:
Children should generally be at least 12 years old to ride in the front passenger seat, based on safety concerns and airbag design. Local laws and vehicle manuals should always be checked for specific requirements.
Step-by-step explanation:
When determining at what age a student can ride in the passenger seat, it's essential to recognize that recommendations can vary based on regional legislation and specific vehicle manufacturer guidelines. However, the general guideline suggests that children should be at least 12 years old before sitting in the front passenger seat. This recommendation is based on safety concerns, as airbags and the design of the front passenger area are typically suited for adult bodies, which are significantly different in size and strength compared to children. Still, the best practice is to always check with local laws and the vehicle's manual, as they can have more stringent or specific requirements.