Final answer:
Provisional licenses typically expire when the individual turns 18 or after a set period post-issuance, but local DMV regulations should be consulted for precise rules. The data collection on teen licensing age aims to analyze regional trends in licensing age.
Step-by-step explanation:
The question about when a provisional license expires for a person under 18 is specific to the laws governing driver licensing in each region or country. While the expiration of a provisional license can vary based on local regulations, it typically expires on the person's 18th birthday or after a specific period from the issuance date, such as one year. However, this information should be confirmed with the local department of motor vehicles (DMV) or equivalent authority, as they provide the accurate rules and regulations regarding provisional licenses.
Regarding the statistical inquiry about the average age at which teenagers obtain their driver's licenses across the country, such a study would involve collecting data from various regions and analyzing it to determine regional differences or consistencies. This type of analysis helps understand trends and behaviors related to teenage driving in different areas.