well if it makes you feel better I bought a '13 brand new in 2013 for around 30k. Just paid it off today.
It can really depend on the condition and care the car got. I've seen newer 86s that look way more beat up at 20k than mine does at 80k. It is really important to inspect it carefully, a real good one won't have any leaks, will sound good, have oil changes documented, and other services. Another good thing to check is for curb rash, this in it of it self isn't a big deal but it gives you insight to how it was driven. Cars that have curb rash may indicate the kind of love and care the car got. Also check under the front lip, see how much it has gotten scraped, all 86s/BRZ have this scrapped at least a little but again gives you an idea of how it was cared for.
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