The manufacturer may be able to interpret the serial number, but there is no universal date code across disposer brands. A number that resembles a year should not be treated as a confirmed manufacturing date.
What the observation tells you
Manufacture, purchase and installation can occur at different times. That distinction matters when describing history or asking about manufacturer cover. A service sticker may record an engineer's visit rather than the appliance's age.
A useful next step
Send a clear label image to the appropriate manufacturer support route and keep receipts or installation records alongside its response. Use the confirmed dates when discussing service options instead of relying on a guessed age.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.