If you want a "complete" set, make sure negative carriers and lens comes with the unit. I do not see them. If the deal does not include them, you'll need them so pay appropriately.
Don't worry about the age of the enlarger. Most of good ones are pretty old. Mine is 50+ years old! I prefer older ones as they are made very VERY well.
What's on the baseboard is the light housing that came with the unit. It has an incandescent light bulb in it.
What's on the enlarger (silver looking unit) is called a "cold light" and it contains a specially made florescent type light bulb. Benefit of using this type of light source is that you are less affected by scratches and dust on negative. Con side is, if the bulb goes, it is very difficult to find a replacement.
Make sure the bellows is light tight and in good shape. Make sure the head goes up and down smoothly. I *think* MX model is motorized, so make sure that works, too.
Here's a link to some info.