10 year old tires ok for highway driving?

There may be another alternative- don't know how it is in your town, but here the local dump- whoops, I mean "Transfer and Recycling Station" -has a tire pile. People throw away pretty decent tires all the time. Or, my local junkyard sells the tires they pull off the wrecks for 10-20 bucks a piece.. people also junk their old cars with some decent tires on them. Personally, I haven't bought a new tire in ten years.