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Explain what you're asking with this.

High Sierra is, as far as I've heard, supporting the mid-2010 and newer MB Pros.
https://en.wikipedia.org/wiki/MacOS_High_Sierra#System_requirements

Whether a mid-2012 MB Pro will keep supporting the OS to 10.14 or 10.15 (or even later), I don't know.

Most likely 10.15 will work on the 2012 MacBook Pros which is fine for me.. this thing is so upgradable, I am not sure I want to go past 2012 because they are no longer upgradable.
 
To finish up this thread so the moderators can lock it - I found what I was looking for on eBay and it wasn’t what I was expecting:

It took me four months of searching and the right buyer for my old MBP, but I found a late 2013 13” MacBook Pro 2.4 GHz/8 GB/256GB that’s practically flawless with NO dents for $600!! Twice as fast as my mid-2009 17” and the new one is running Mojave like a dream. It’s so fast and light.

Thanks for all your comments and suggestions.

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