Sounds like the person trading is getting the better deal... it has almost double the miles of your truck.
If you're intent on trading, definitely plan on possible engine components going out in the near future along with the tranny. No doubt suspension components (struts, wheel bearings, etc.) are ending their useful life if they haven't already. Have those been replaced? Lastly, make sure the paint is good. Some Avengers left the factory with contaminated paint which led to fading and sometimes peeling.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne