Look at the original receipt. If not available, check the model and serial numbers with Yamaha (through Tom Lee) and confirm the piano is really 5 years old.
You can also open up the front panel (be careful, very heavy) or just the top panel to check the parts inside. If you find some wooden parts or strings or felts that look newer than the others, then the original ones must have had some problem and got replaced. In this case, it is very likely that the piano is older than 5 years.
Open up the bottom panel below the keyboard (be careful, very heavy). Check if there is a "warmer" placed inside. This should be used when the humidity is >80% ONLY. Ask the owner if he turns it on when it's humid and OFF WHEN IT'S DRY. Some people keeps it on all the time. This actually is not good for the piano. When the weather is dry, it makes the piano "too" dry and the glue keeping the wooden parts together becomes hardened and eventually the parts will fall apart. The falling apart probably won't happen now (5 years) but it will happen sooner then when it should be. So in a few years' time, you will need to pay thousands for a major repair.
It will be best to bring along your piano teacher and a piano tuner/technician, especially to help you with taking off the panels.
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