If you are looking for product documentation & specs, downloads, etc. then that page is here:
"... information of my own serial number ..."
Although available for most Canon lenses, mostly "L" models, I don't think, or know, of any reliable info on camera bodies.
Like Ebiggs said, there is no reliable way to tell when the camera is made. You asked this information so I assume that you didn't buy the camera new. I don't think the year it made is important. If you bought it used, you may want to to know the shutter count more and that is what most people care about when buying used camera (beside cosmetic of course). There is a website called eoscount.com where people have been reported that it can tell how many photo your camera has been taken. It only works in Windows OS with IE browers. If the camera is refurbished by Canon, they may reset the camera actuation.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.