1989 Ford f 150 for $850 and still runs?

Says it still runs strong. How can it only be 850. What should I look for before buying?

That truck is 28 years old. Check for body rust, damage to the floorboards, and smooth operation when driving. Check the condition of the tires, and look for oil or water leaks in the engine. Look at the oil, and make sure it does not look like a chocolate milkshake that has melted.

If it looks good to you, take it to your own qualified mechanic to have it checked (at your expense)

$800 seems to be a reasonable price for a running truck that is that old