Determine Bosch and Thermador appliances age by the serial number:
Example serial number FD81025564
The serial number will start with FD.
Ignore the FD and the first number after the FD.
Move to the fourth character (this will be the year)
Then move to the fifth and six character this will be the month.

So the manufacture date on this example is February 2001.
With the month (02) second month of the year.
And the (1) being first year of 2001.