I am considering buying a model 921045 24"deluxe Ariens snow blower serial number 084201. Can you tell me when this was manufactured?

The year of manufacturing is right on the model/serial number tag above the serial number...

 

Here's couple of better images. [20]05:

2015:

 

It's not so much when a machine was made, but how it has been used or abused throughout its life .....

I have seen new units destroyed and old units in mint condition.

All about in person condition and operation.