What is the age of a river and Johnson's arms and cycle works 22 no L22848?

The age of a river is determined by its geological history and the time it has been flowing, which can range from thousands to millions of years. However, "Johnson's Arms and Cycle Works 22 no L22848" seems to refer to a specific product or item, perhaps a bicycle, rather than a river. If you need specific information about the age of a bicycle or its model history, it would be best to consult the manufacturer or specific records related to that product.