How old is this MacBook Pro?

Going by memory i would say it's between late 2008 and mid 2009 model

Cheers

 

Mid-2010 according to MacTracker.

Why do you ask?

 

Here

 

So the 5,3 is the identifier? What is mine then? 8,something?

 

Yes - 5,3 is the identifier. The 5 being the generation and the 3 being which version of that generation.

 

You could look for it:

Identify your Mac and Mac OS X version, visualised in a more elaborate image
Identify your Mac and Mac OS X version using this 25 second video tutorial (3MB, .mp4, H.264)​

Btw, the machine was built in January 2010: http://appleserialnumberinfo.com/Desktop/index.php

 

Looking at the serial number, the first W8 shows the manufacture site, and the next numerical digit shows the year of manufacture – '0', so it's a 2010 model. The next two digits show the week of manufacture – '05', so it was built in the fifth week of that year.

So, your Mac was built in January 2010.

 

Thank you, sir!