How do I tell if my mac book air will run mountain lion?

I've seen it asked a lot of times.  I've seen the same answer every time, which is "so long as it's a late 2008 model"
My macbook air is silver... it says "macbook air" on it... I bought it once upon a time... it is running leopard... it does not appear to have a date stamp...
Do macbook air once-upon-a-time models run mountain lion?  Or is there, possibly, some clue somewhere in the system data and about boxes that I might check?  You know, like processor speed or graphics or memory?  What does "late" 2008 mean anyway?  how late?  If I bought it in August it won't work but if I bought it in September from a shop that had been stocking it since June it will?  Come on...
I don't even want to upgrade, I just find I pretty much have to now or I can't access anything (like the app store).  I'm feeling obliged to pay to keep my machine working without being able to work out in advance if I even can - this has put me in a fairly negative frame of mind, and is why you are going to have to live with a fairly grumpy help request!
Anyone know what the real criteria are?

Apple uses descriptors like "Late 2008" to indicate when models change. It has nothing to do with the time of year a system might be sold. The late 2008 MBA specs are here. 
Type in your systems serial number here, and it will tell you what you have. You can find your serial number by clicking on the apple to the left side of the menu bar. Underneath the MAC OS X where it says what level of operating system you have, click on that until you see the serial number.

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