A person who is ___ years old may drive a motorcycle with an engine exceeding 125cc, provided they show proof of previous experience.

A person who is 20 years old is permitted to drive a motorcycle with an engine exceeding 125cc, as long as they can present evidence of previous riding experience. This age requirement often reflects regulations that balance a rider's maturity and capability with the responsibilities of operating more powerful motorcycles. Generally, regulatory bodies establish minimum age limits as part of a broader effort to ensure that drivers have not only the necessary skills but also the judgment that comes with being older.

The emphasis on previous experience is significant, as it indicates that top performance and safe handling of motorcycles with larger engines require not only age but also practice and familiarity with the vehicle. This provision exists to enhance safety on the roads by ensuring that riders who operate heavier motorcycles can do so competently and responsibly.