What is the age of a Scherl and Roth viola model number R403E152?

The age of a Scherl and Roth viola model number R403E152 can be determined by its serial number, which typically indicates the year of manufacture. Scherl and Roth instruments were produced starting in the mid-20th century, so if you have the serial number, you can check with the manufacturer or a violin shop for a more precise date. Without that information, it's difficult to specify the age accurately.