When choosing a dirt jump bike, it's important to consider factors such as your skill level, budget, and the type of riding you plan to do. Some popular dirt jump bike brands include Specialized, Trek, and Norco. It's recommended to test ride a few different models to see which one feels the most comfortable and suits your riding style before making a decision. Ultimately, the best dirt jump bike for you will be one that fits your needs and preferences. **

A bike park dirt bike is a type of off-road motorcycle specifically designed for use in bike parks and dirt tracks. These bikes are typically lightweight, agile, and have specialized features such as knobby tires, long-travel suspension, and sturdy frames to handle the rough terrain and jumps found in bike parks. Riders use these bikes to navigate obstacles, jumps, and berms with speed and control, making them popular for freestyle riding and competitions in bike parks. **

The gear shifting of a dirt bike works by using a foot lever to change the position of the gear shift drum, which in turn changes the gear ratio. When the rider presses down on the gear shift lever, it moves the shift drum to engage a different gear. This allows the rider to adjust the power and speed of the bike to match the terrain and riding conditions. The gear shifting mechanism is typically located on the left side of the bike, and the rider can shift up or down through the gears as needed. **

It ultimately depends on personal preference and the specific type of riding you want to do. BMX bikes are typically lighter and more maneuverable, making them better for technical tricks and jumps on dirt tracks. On the other hand, dirt bikes are more powerful and can handle larger jumps and rougher terrain. If you prefer a more agile and technical riding style, a BMX bike may be better for you. If you prefer larger jumps and more aggressive riding, a dirt bike may be the better choice. **

A Dirt Pumptrack Bike is a specialized type of bicycle designed for riding on pump tracks, which are compact dirt tracks with rollers and berms that allow riders to gain momentum without pedaling. These bikes typically have smaller wheels, a rigid frame, and a BMX or dirt jump-style design to provide agility and maneuverability on the track. Dirt Pumptrack Bikes are popular among riders looking to improve their skills in pumping and jumping on off-road tracks. **

A moped dirt bike is a type of motorized two-wheeled vehicle that combines features of both a moped and a dirt bike. It typically has a small engine, similar to a moped, but is designed for off-road use like a dirt bike. Moped dirt bikes are popular for recreational riding on trails and in off-road environments, offering a fun and versatile option for riders looking for a mix of on-road and off-road capabilities. **

A Mofa dirt bike is a type of off-road motorcycle that is designed for riding on rough, unpaved terrain. These bikes are typically lightweight and have rugged suspension systems to handle the bumps and jumps of off-road riding. They often have knobby tires for better traction and are equipped with powerful engines to navigate through challenging terrain. Mofa dirt bikes are popular among off-road enthusiasts and are used for activities such as trail riding, motocross racing, and enduro competitions. **

The age of the dirt bike is not provided in the given information. In order to determine the age of the dirt bike, we would need to know the year it was manufactured or purchased. Without this information, it is not possible to accurately determine the age of the dirt bike. **