Ok, he did mention "new tyres" in the Craigslist ad. Hadn't noticed that...
Yes, after so much time there will always be something. If it is in "perfect" condition, it probably has seen too little use for it's own good. If it has been used, it is going to show signs of wear.
I don't mean to say "don't buy it", particularly if the price is good. Rather, more or less what you say yourself, the thing is old, and is likely to have some issues, no matter how good it looks from the outside. One should bear that in mind.