Askem where the turbo is located. When they tell you it doesn't have one shake your head in disappointment and politely let them know that it needs one and will lower the sale price significantly.
You might get lucky and it works
In reality, if you purchase a used machine there is always a risk. Make the seller your buddy thru conversation and they will most likely tell you everything. Look for mud that is caked in hard to reach places, that is an indication of whether or not they drove it hard. Always push for a good price. The lower the cost means the easier you can take care of a problem you may find later. I would recommend with any machine the moment you get it change all fluids. That alone is cheap insurance and will prove if they ever had water intrusion. Most importantly is drive it! Make sure it shifts right, make sure it gets warm and the fan kicks on and it doesn't overheat. Make sure all the buttons and switches work. Check for leaks. Anytime I buy something I will literally let it run while I talk with the seller and in the background listen to the machine. Does it miss, does it smell strange, and after it's hot can I restart the machine a couple times without issue. If the machine was warm when you get there then usually it means the machine might be cold natured/hard to start, or the battery was dead and they jump started it before you got there.
There is alot of good information above.
The true reality of your question tho is that you are looking at a 21. I highly doubt it has had much abuse. If it fires up and runs and drives perfect with all switches and buttons working I would not hesitate as much as I would on something older with higher miles. I would bring it home, clean it up, still change all the fluids just in case, and be happy with it.