when to pull the plug??

I have a compressor ...sears craftsman 33 Gal horizontal tank and it was new in 2003. My dad has the receipt from a black Friday special in 2003.

To put it lightly, I have used the crap out of it all these years and in the last few months I have noticed it sounds a little off when you first start it and then it straightens up and sounds ok after a few minutes of run time. It still functions well but it is slower to fill up now.

I recently borrowed my friends compressor and only then did I realize how much mine has slowed down and takes longer to fill up.

Is there a fix to lower the recovery time like when it was new or how long are these things supposed to last?

Nothing to complain about, its old and Craftsman over in China won't stand behind it so time for a motor rebuild or a better compressor that's Made in the USA.